Add API for static strings, primarily good for identifiers.
Thanks to Konrad Schöbel and Jasper Schulz for helping with the mass-editing.
diff --git a/Modules/_bisectmodule.c b/Modules/_bisectmodule.c
index 7fecfc6..9da255e 100644
--- a/Modules/_bisectmodule.c
+++ b/Modules/_bisectmodule.c
@@ -86,7 +86,9 @@
         if (PyList_Insert(list, index, item) < 0)
             return NULL;
     } else {
-        result = PyObject_CallMethod(list, "insert", "nO", index, item);
+        _Py_identifier(insert);
+
+        result = _PyObject_CallMethodId(list, &PyId_insert, "nO", index, item);
         if (result == NULL)
             return NULL;
         Py_DECREF(result);
@@ -186,7 +188,9 @@
         if (PyList_Insert(list, index, item) < 0)
             return NULL;
     } else {
-        result = PyObject_CallMethod(list, "insert", "iO", index, item);
+        _Py_identifier(insert);
+
+        result = _PyObject_CallMethodId(list, &PyId_insert, "iO", index, item);
         if (result == NULL)
             return NULL;
         Py_DECREF(result);
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index 156ad18..40e253d 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -1334,13 +1334,15 @@
     PyObject *items;
     PyObject *iter;
     PyObject *result;
+    _Py_identifier(items);
+
     if (dd->default_factory == NULL || dd->default_factory == Py_None)
         args = PyTuple_New(0);
     else
         args = PyTuple_Pack(1, dd->default_factory);
     if (args == NULL)
         return NULL;
-    items = PyObject_CallMethod((PyObject *)dd, "items", "()");
+    items = _PyObject_CallMethodId((PyObject *)dd, &PyId_items, "()");
     if (items == NULL) {
         Py_DECREF(args);
         return NULL;
diff --git a/Modules/_ctypes/_ctypes.c b/Modules/_ctypes/_ctypes.c
index e2905bc..1d7cf94 100644
--- a/Modules/_ctypes/_ctypes.c
+++ b/Modules/_ctypes/_ctypes.c
@@ -3679,8 +3679,10 @@
             PyTuple_SET_ITEM(tup, index, v);
             index++;
         } else if (bit & outmask) {
+            _Py_identifier(__ctypes_from_outparam__);
+
             v = PyTuple_GET_ITEM(callargs, i);
-            v = PyObject_CallMethod(v, "__ctypes_from_outparam__", NULL);
+            v = _PyObject_CallMethodId(v, &PyId___ctypes_from_outparam__, NULL);
             if (v == NULL || numretvals == 1) {
                 Py_DECREF(callargs);
                 return v;
diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c
index 60d59c8..adc2870 100644
--- a/Modules/_ctypes/callproc.c
+++ b/Modules/_ctypes/callproc.c
@@ -1687,13 +1687,15 @@
     PyObject *state;
     PyObject *result;
     PyObject *tmp;
+    _Py_identifier(__new__);
+    _Py_identifier(__setstate__);
 
     if (!PyArg_ParseTuple(args, "OO", &typ, &state))
         return NULL;
-    result = PyObject_CallMethod(typ, "__new__", "O", typ);
+    result = _PyObject_CallMethodId(typ, &PyId___new__, "O", typ);
     if (result == NULL)
         return NULL;
-    tmp = PyObject_CallMethod(result, "__setstate__", "O", state);
+    tmp = _PyObject_CallMethodId(result, &PyId___setstate__, "O", state);
     if (tmp == NULL) {
         Py_DECREF(result);
         return NULL;
diff --git a/Modules/_cursesmodule.c b/Modules/_cursesmodule.c
index 191d53f..ead38d3 100644
--- a/Modules/_cursesmodule.c
+++ b/Modules/_cursesmodule.c
@@ -1418,10 +1418,12 @@
     while (1) {
         char buf[BUFSIZ];
         Py_ssize_t n = fread(buf, 1, BUFSIZ, fp);
+        _Py_identifier(write);
+
         if (n <= 0)
             break;
         Py_DECREF(res);
-        res = PyObject_CallMethod(stream, "write", "y#", buf, n);
+        res = _PyObject_CallMethodId(stream, &PyId_write, "y#", buf, n);
         if (res == NULL)
             break;
     }
@@ -1911,6 +1913,7 @@
     WINDOW *win;
 
     PyCursesInitialised;
+    _Py_identifier(read);
 
     strcpy(fn, "/tmp/py.curses.getwin.XXXXXX");
     fd = mkstemp(fn);
@@ -1922,7 +1925,7 @@
         remove(fn);
         return PyErr_SetFromErrnoWithFilename(PyExc_IOError, fn);
     }
-    data = PyObject_CallMethod(stream, "read", "");
+    data = _PyObject_CallMethodId(stream, &PyId_read, "");
     if (data == NULL) {
         fclose(fp);
         remove(fn);
diff --git a/Modules/_datetimemodule.c b/Modules/_datetimemodule.c
index a7156a4..eb6998f 100644
--- a/Modules/_datetimemodule.c
+++ b/Modules/_datetimemodule.c
@@ -946,6 +946,7 @@
 call_tzname(PyObject *tzinfo, PyObject *tzinfoarg)
 {
     PyObject *result;
+    _Py_identifier(tzname);
 
     assert(tzinfo != NULL);
     assert(check_tzinfo_subclass(tzinfo) >= 0);
@@ -954,7 +955,7 @@
     if (tzinfo == Py_None)
         Py_RETURN_NONE;
 
-    result = PyObject_CallMethod(tzinfo, "tzname", "O", tzinfoarg);
+    result = _PyObject_CallMethodId(tzinfo, &PyId_tzname, "O", tzinfoarg);
 
     if (result == NULL || result == Py_None)
         return result;
@@ -1078,6 +1079,8 @@
     PyObject *temp;
     PyObject *tzinfo = get_tzinfo_member(object);
     PyObject *Zreplacement = PyUnicode_FromStringAndSize(NULL, 0);
+    _Py_identifier(replace);
+	
     if (Zreplacement == NULL)
         return NULL;
     if (tzinfo == Py_None || tzinfo == NULL)
@@ -1098,7 +1101,7 @@
      * strftime doesn't treat them as format codes.
      */
     Py_DECREF(Zreplacement);
-    Zreplacement = PyObject_CallMethod(temp, "replace", "ss", "%", "%%");
+    Zreplacement = _PyObject_CallMethodId(temp, &PyId_replace, "ss", "%", "%%");
     Py_DECREF(temp);
     if (Zreplacement == NULL)
         return NULL;
@@ -1281,12 +1284,15 @@
     {
         PyObject *format;
         PyObject *time = PyImport_ImportModuleNoBlock("time");
+
         if (time == NULL)
             goto Done;
         format = PyUnicode_FromString(PyBytes_AS_STRING(newfmt));
         if (format != NULL) {
-            result = PyObject_CallMethod(time, "strftime", "OO",
-                                         format, timetuple, NULL);
+            _Py_identifier(strftime);
+
+            result = _PyObject_CallMethodId(time, &PyId_strftime, "OO",
+                                            format, timetuple, NULL);
             Py_DECREF(format);
         }
         Py_DECREF(time);
@@ -1312,7 +1318,9 @@
     PyObject *time = PyImport_ImportModuleNoBlock("time");
 
     if (time != NULL) {
-        result = PyObject_CallMethod(time, "time", "()");
+        _Py_identifier(time);
+
+        result = _PyObject_CallMethodId(time, &PyId_time, "()");
         Py_DECREF(time);
     }
     return result;
@@ -1329,13 +1337,15 @@
 
     time = PyImport_ImportModuleNoBlock("time");
     if (time != NULL) {
-        result = PyObject_CallMethod(time, "struct_time",
-                                     "((iiiiiiiii))",
-                                     y, m, d,
-                                     hh, mm, ss,
-                                     weekday(y, m, d),
-                                     days_before_month(y, m) + d,
-                                     dstflag);
+        _Py_identifier(struct_time);
+
+        result = _PyObject_CallMethodId(time, &PyId_struct_time,
+                                        "((iiiiiiiii))",
+                                        y, m, d,
+                                        hh, mm, ss,
+                                        weekday(y, m, d),
+                                        days_before_month(y, m) + d,
+                                        dstflag);
         Py_DECREF(time);
     }
     return result;
@@ -1568,11 +1578,12 @@
     PyObject *result = NULL;
     PyObject *pyus_in = NULL, *temp, *pyus_out;
     PyObject *ratio = NULL;
+    _Py_identifier(as_integer_ratio);
 
     pyus_in = delta_to_microseconds(delta);
     if (pyus_in == NULL)
         return NULL;
-    ratio = PyObject_CallMethod(floatobj, "as_integer_ratio", NULL);
+    ratio = _PyObject_CallMethodId(floatobj, &PyId_as_integer_ratio, NULL);
     if (ratio == NULL)
         goto error;
     temp = PyNumber_Multiply(pyus_in, PyTuple_GET_ITEM(ratio, 0));
@@ -1666,11 +1677,12 @@
     PyObject *result = NULL;
     PyObject *pyus_in = NULL, *temp, *pyus_out;
     PyObject *ratio = NULL;
+    _Py_identifier(as_integer_ratio);
 
     pyus_in = delta_to_microseconds(delta);
     if (pyus_in == NULL)
         return NULL;
-    ratio = PyObject_CallMethod(f, "as_integer_ratio", NULL);
+    ratio = _PyObject_CallMethodId(f, &PyId_as_integer_ratio, NULL);
     if (ratio == NULL)
         goto error;
     temp = PyNumber_Multiply(pyus_in, PyTuple_GET_ITEM(ratio, 1));
@@ -2461,6 +2473,7 @@
 {
     PyObject *time;
     PyObject *result;
+    _Py_identifier(fromtimestamp);
 
     time = time_time();
     if (time == NULL)
@@ -2472,7 +2485,7 @@
      * time.time() delivers; if someone were gonzo about optimization,
      * date.today() could get away with plain C time().
      */
-    result = PyObject_CallMethod(cls, "fromtimestamp", "O", time);
+    result = _PyObject_CallMethodId(cls, &PyId_fromtimestamp, "O", time);
     Py_DECREF(time);
     return result;
 }
@@ -2613,7 +2626,9 @@
 static PyObject *
 date_str(PyDateTime_Date *self)
 {
-    return PyObject_CallMethod((PyObject *)self, "isoformat", "()");
+    _Py_identifier(isoformat);
+
+    return _PyObject_CallMethodId((PyObject *)self, &PyId_isoformat, "()");
 }
 
 
@@ -2632,13 +2647,14 @@
     PyObject *result;
     PyObject *tuple;
     PyObject *format;
+    _Py_identifier(timetuple);
     static char *keywords[] = {"format", NULL};
 
     if (! PyArg_ParseTupleAndKeywords(args, kw, "U:strftime", keywords,
                                       &format))
         return NULL;
 
-    tuple = PyObject_CallMethod((PyObject *)self, "timetuple", "()");
+    tuple = _PyObject_CallMethodId((PyObject *)self, &PyId_timetuple, "()");
     if (tuple == NULL)
         return NULL;
     result = wrap_strftime((PyObject *)self, format, tuple,
@@ -2651,6 +2667,7 @@
 date_format(PyDateTime_Date *self, PyObject *args)
 {
     PyObject *format;
+    _Py_identifier(strftime);
 
     if (!PyArg_ParseTuple(args, "U:__format__", &format))
         return NULL;
@@ -2659,7 +2676,7 @@
     if (PyUnicode_GetSize(format) == 0)
         return PyObject_Str((PyObject *)self);
 
-    return PyObject_CallMethod((PyObject *)self, "strftime", "O", format);
+    return _PyObject_CallMethodId((PyObject *)self, &PyId_strftime, "O", format);
 }
 
 /* ISO methods. */
@@ -3573,7 +3590,9 @@
 static PyObject *
 time_str(PyDateTime_Time *self)
 {
-    return PyObject_CallMethod((PyObject *)self, "isoformat", "()");
+    _Py_identifier(isoformat);
+
+    return _PyObject_CallMethodId((PyObject *)self, &PyId_isoformat, "()");
 }
 
 static PyObject *
@@ -4152,7 +4171,9 @@
     if (self != NULL && tzinfo != Py_None) {
         /* Convert UTC to tzinfo's zone. */
         PyObject *temp = self;
-        self = PyObject_CallMethod(tzinfo, "fromutc", "O", self);
+        _Py_identifier(fromutc);
+
+        self = _PyObject_CallMethodId(tzinfo, &PyId_fromutc, "O", self);
         Py_DECREF(temp);
     }
     return self;
@@ -4189,7 +4210,9 @@
     if (self != NULL && tzinfo != Py_None) {
         /* Convert UTC to tzinfo's zone. */
         PyObject *temp = self;
-        self = PyObject_CallMethod(tzinfo, "fromutc", "O", self);
+        _Py_identifier(fromutc);
+
+        self = _PyObject_CallMethodId(tzinfo, &PyId_fromutc, "O", self);
         Py_DECREF(temp);
     }
     return self;
@@ -4214,6 +4237,7 @@
 {
     static PyObject *module = NULL;
     PyObject *string, *format;
+    _Py_identifier(_strptime_datetime);
 
     if (!PyArg_ParseTuple(args, "UU:strptime", &string, &format))
         return NULL;
@@ -4223,8 +4247,8 @@
         if (module == NULL)
             return NULL;
     }
-    return PyObject_CallMethod(module, "_strptime_datetime", "OOO",
-                               cls, string, format);
+    return _PyObject_CallMethodId(module, &PyId__strptime_datetime, "OOO",
+                                 cls, string, format);
 }
 
 /* Return new datetime from date/datetime and time arguments. */
@@ -4469,7 +4493,9 @@
 static PyObject *
 datetime_str(PyDateTime_DateTime *self)
 {
-    return PyObject_CallMethod((PyObject *)self, "isoformat", "(s)", " ");
+    _Py_identifier(isoformat);
+
+    return _PyObject_CallMethodId((PyObject *)self, &PyId_isoformat, "(s)", " ");
 }
 
 static PyObject *
@@ -4676,6 +4702,7 @@
     PyObject *offset;
     PyObject *temp;
     PyObject *tzinfo;
+    _Py_identifier(fromutc);
     static char *keywords[] = {"tz", NULL};
 
     if (! PyArg_ParseTupleAndKeywords(args, kw, "O!:astimezone", keywords,
@@ -4717,7 +4744,7 @@
     Py_DECREF(temp);
 
     temp = result;
-    result = PyObject_CallMethod(tzinfo, "fromutc", "O", temp);
+    result = _PyObject_CallMethodId(tzinfo, &PyId_fromutc, "O", temp);
     Py_DECREF(temp);
 
     return result;
diff --git a/Modules/_elementtree.c b/Modules/_elementtree.c
index 0c64dd5..fcd1271 100644
--- a/Modules/_elementtree.c
+++ b/Modules/_elementtree.c
@@ -790,16 +790,18 @@
 element_find(ElementObject* self, PyObject* args)
 {
     int i;
-
     PyObject* tag;
     PyObject* namespaces = Py_None;
+
     if (!PyArg_ParseTuple(args, "O|O:find", &tag, &namespaces))
         return NULL;
 
-    if (checkpath(tag) || namespaces != Py_None)
-        return PyObject_CallMethod(
-            elementpath_obj, "find", "OOO", self, tag, namespaces
+    if (checkpath(tag) || namespaces != Py_None) {
+        _Py_identifier(find);
+        return _PyObject_CallMethodId(
+            elementpath_obj, &PyId_find, "OOO", self, tag, namespaces
             );
+    }
 
     if (!self->extra)
         Py_RETURN_NONE;
@@ -820,16 +822,17 @@
 element_findtext(ElementObject* self, PyObject* args)
 {
     int i;
-
     PyObject* tag;
     PyObject* default_value = Py_None;
     PyObject* namespaces = Py_None;
+    _Py_identifier(findtext);
+
     if (!PyArg_ParseTuple(args, "O|OO:findtext", &tag, &default_value, &namespaces))
         return NULL;
 
     if (checkpath(tag) || namespaces != Py_None)
-        return PyObject_CallMethod(
-            elementpath_obj, "findtext", "OOOO", self, tag, default_value, namespaces
+        return _PyObject_CallMethodId(
+            elementpath_obj, &PyId_findtext, "OOOO", self, tag, default_value, namespaces
             );
 
     if (!self->extra) {
@@ -858,16 +861,18 @@
 {
     int i;
     PyObject* out;
-
     PyObject* tag;
     PyObject* namespaces = Py_None;
+
     if (!PyArg_ParseTuple(args, "O|O:findall", &tag, &namespaces))
         return NULL;
 
-    if (checkpath(tag) || namespaces != Py_None)
-        return PyObject_CallMethod(
-            elementpath_obj, "findall", "OOO", self, tag, namespaces
+    if (checkpath(tag) || namespaces != Py_None) {
+        _Py_identifier(findall);
+        return _PyObject_CallMethodId(
+            elementpath_obj, &PyId_findall, "OOO", self, tag, namespaces
             );
+    }
 
     out = PyList_New(0);
     if (!out)
@@ -895,11 +900,13 @@
 {
     PyObject* tag;
     PyObject* namespaces = Py_None;
+    _Py_identifier(iterfind);
+
     if (!PyArg_ParseTuple(args, "O|O:iterfind", &tag, &namespaces))
         return NULL;
 
-    return PyObject_CallMethod(
-        elementpath_obj, "iterfind", "OOO", self, tag, namespaces
+    return _PyObject_CallMethodId(
+        elementpath_obj, &PyId_iterfind, "OOO", self, tag, namespaces
         );
 }
 
diff --git a/Modules/_io/_iomodule.c b/Modules/_io/_iomodule.c
index 6f5bd48..f264756 100644
--- a/Modules/_io/_iomodule.c
+++ b/Modules/_io/_iomodule.c
@@ -308,6 +308,9 @@
 
     PyObject *raw, *modeobj = NULL, *buffer = NULL, *wrapper = NULL;
 
+    _Py_identifier(isatty);
+    _Py_identifier(fileno);
+
     if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|sizzzi:open", kwlist,
                                      &file, &mode, &buffering,
                                      &encoding, &errors, &newline,
@@ -421,7 +424,7 @@
 
     /* buffering */
     {
-        PyObject *res = PyObject_CallMethod(raw, "isatty", NULL);
+        PyObject *res = _PyObject_CallMethodId(raw, &PyId_isatty, NULL);
         if (res == NULL)
             goto error;
         isatty = PyLong_AsLong(res);
@@ -443,7 +446,7 @@
         {
             struct stat st;
             long fileno;
-            PyObject *res = PyObject_CallMethod(raw, "fileno", NULL);
+            PyObject *res = _PyObject_CallMethodId(raw, &PyId_fileno, NULL);
             if (res == NULL)
                 goto error;
 
diff --git a/Modules/_io/bufferedio.c b/Modules/_io/bufferedio.c
index 86f7412..6ef2c20 100644
--- a/Modules/_io/bufferedio.c
+++ b/Modules/_io/bufferedio.c
@@ -13,6 +13,18 @@
 #include "pythread.h"
 #include "_iomodule.h"
 
+_Py_identifier(close);
+_Py_identifier(_dealloc_warn);
+_Py_identifier(flush);
+_Py_identifier(isatty);
+_Py_identifier(peek);
+_Py_identifier(read);
+_Py_identifier(read1);
+_Py_identifier(readable);
+_Py_identifier(readinto);
+_Py_identifier(writable);
+_Py_identifier(write);
+
 /*
  * BufferedIOBase class, inherits from IOBase.
  */
@@ -38,12 +50,13 @@
     Py_buffer buf;
     Py_ssize_t len;
     PyObject *data;
+    _Py_identifier(read);
 
     if (!PyArg_ParseTuple(args, "w*:readinto", &buf)) {
         return NULL;
     }
 
-    data = PyObject_CallMethod(self, "read", "n", buf.len);
+    data = _PyObject_CallMethodId(self, &PyId_read, "n", buf.len);
     if (data == NULL)
         goto error;
 
@@ -410,7 +423,7 @@
 {
     if (self->ok && self->raw) {
         PyObject *r;
-        r = PyObject_CallMethod(self->raw, "_dealloc_warn", "O", source);
+        r = _PyObject_CallMethodId(self->raw, &PyId__dealloc_warn, "O", source);
         if (r)
             Py_DECREF(r);
         else
@@ -2216,13 +2229,13 @@
 }
 
 static PyObject *
-_forward_call(buffered *self, const char *name, PyObject *args)
+_forward_call(buffered *self, _Py_Identifier *name, PyObject *args)
 {
-    PyObject *func = PyObject_GetAttrString((PyObject *)self, name);
+    PyObject *func = _PyObject_GetAttrId((PyObject *)self, name);
     PyObject *ret;
 
     if (func == NULL) {
-        PyErr_SetString(PyExc_AttributeError, name);
+        PyErr_SetString(PyExc_AttributeError, name->string);
         return NULL;
     }
 
@@ -2234,66 +2247,66 @@
 static PyObject *
 bufferedrwpair_read(rwpair *self, PyObject *args)
 {
-    return _forward_call(self->reader, "read", args);
+    return _forward_call(self->reader, &PyId_read, args);
 }
 
 static PyObject *
 bufferedrwpair_peek(rwpair *self, PyObject *args)
 {
-    return _forward_call(self->reader, "peek", args);
+    return _forward_call(self->reader, &PyId_peek, args);
 }
 
 static PyObject *
 bufferedrwpair_read1(rwpair *self, PyObject *args)
 {
-    return _forward_call(self->reader, "read1", args);
+    return _forward_call(self->reader, &PyId_read1, args);
 }
 
 static PyObject *
 bufferedrwpair_readinto(rwpair *self, PyObject *args)
 {
-    return _forward_call(self->reader, "readinto", args);
+    return _forward_call(self->reader, &PyId_readinto, args);
 }
 
 static PyObject *
 bufferedrwpair_write(rwpair *self, PyObject *args)
 {
-    return _forward_call(self->writer, "write", args);
+    return _forward_call(self->writer, &PyId_write, args);
 }
 
 static PyObject *
 bufferedrwpair_flush(rwpair *self, PyObject *args)
 {
-    return _forward_call(self->writer, "flush", args);
+    return _forward_call(self->writer, &PyId_flush, args);
 }
 
 static PyObject *
 bufferedrwpair_readable(rwpair *self, PyObject *args)
 {
-    return _forward_call(self->reader, "readable", args);
+    return _forward_call(self->reader, &PyId_readable, args);
 }
 
 static PyObject *
 bufferedrwpair_writable(rwpair *self, PyObject *args)
 {
-    return _forward_call(self->writer, "writable", args);
+    return _forward_call(self->writer, &PyId_writable, args);
 }
 
 static PyObject *
 bufferedrwpair_close(rwpair *self, PyObject *args)
 {
-    PyObject *ret = _forward_call(self->writer, "close", args);
+    PyObject *ret = _forward_call(self->writer, &PyId_close, args);
     if (ret == NULL)
         return NULL;
     Py_DECREF(ret);
 
-    return _forward_call(self->reader, "close", args);
+    return _forward_call(self->reader, &PyId_close, args);
 }
 
 static PyObject *
 bufferedrwpair_isatty(rwpair *self, PyObject *args)
 {
-    PyObject *ret = _forward_call(self->writer, "isatty", args);
+    PyObject *ret = _forward_call(self->writer, &PyId_isatty, args);
 
     if (ret != Py_False) {
         /* either True or exception */
@@ -2301,7 +2314,7 @@
     }
     Py_DECREF(ret);
 
-    return _forward_call(self->reader, "isatty", args);
+    return _forward_call(self->reader, &PyId_isatty, args);
 }
 
 static PyObject *
diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index 2bf8933..a16d13c 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -128,6 +128,7 @@
 static PyObject *
 fileio_close(fileio *self)
 {
+    _Py_identifier(close);
     if (!self->closefd) {
         self->fd = -1;
         Py_RETURN_NONE;
@@ -143,8 +144,8 @@
     if (errno < 0)
         return NULL;
 
-    return PyObject_CallMethod((PyObject*)&PyRawIOBase_Type,
-                               "close", "O", self);
+    return _PyObject_CallMethodId((PyObject*)&PyRawIOBase_Type,
+                                  &PyId_close, "O", self);
 }
 
 static PyObject *
diff --git a/Modules/_io/iobase.c b/Modules/_io/iobase.c
index 35c7cdd..6a94a04 100644
--- a/Modules/_io/iobase.c
+++ b/Modules/_io/iobase.c
@@ -97,7 +97,9 @@
 static PyObject *
 iobase_tell(PyObject *self, PyObject *args)
 {
-    return PyObject_CallMethod(self, "seek", "ii", 0, 1);
+    _Py_identifier(seek);
+
+    return _PyObject_CallMethodId(self, &PyId_seek, "ii", 0, 1);
 }
 
 PyDoc_STRVAR(iobase_truncate_doc,
@@ -464,6 +466,7 @@
     int has_peek = 0;
     PyObject *buffer, *result;
     Py_ssize_t old_size = -1;
+    _Py_identifier(read);
 
     if (!PyArg_ParseTuple(args, "|O&:readline", &_PyIO_ConvertSsize_t, &limit)) {
         return NULL;
@@ -481,7 +484,9 @@
         PyObject *b;
 
         if (has_peek) {
-            PyObject *readahead = PyObject_CallMethod(self, "peek", "i", 1);
+            _Py_identifier(peek);
+            PyObject *readahead = _PyObject_CallMethodId(self, &PyId_peek, "i", 1);
+
             if (readahead == NULL)
                 goto fail;
             if (!PyBytes_Check(readahead)) {
@@ -515,7 +520,7 @@
             Py_DECREF(readahead);
         }
 
-        b = PyObject_CallMethod(self, "read", "n", nreadahead);
+        b = _PyObject_CallMethodId(self, &PyId_read, "n", nreadahead);
         if (b == NULL)
             goto fail;
         if (!PyBytes_Check(b)) {
@@ -601,7 +606,9 @@
         /* XXX special-casing this made sense in the Python version in order
            to remove the bytecode interpretation overhead, but it could
            probably be removed here. */
-        PyObject *ret = PyObject_CallMethod(result, "extend", "O", self);
+        _Py_identifier(extend);
+        PyObject *ret = _PyObject_CallMethodId(result, &PyId_extend, "O", self);
+
         if (ret == NULL) {
             Py_DECREF(result);
             return NULL;
@@ -781,8 +788,11 @@
         return NULL;
     }
 
-    if (n < 0)
-        return PyObject_CallMethod(self, "readall", NULL);
+    if (n < 0) {
+        _Py_identifier(readall);
+
+        return _PyObject_CallMethodId(self, &PyId_readall, NULL);
+    }
 
     /* TODO: allocate a bytes object directly instead and manually construct
        a writable memoryview pointing to it. */
@@ -823,8 +833,9 @@
         return NULL;
 
     while (1) {
-        PyObject *data = PyObject_CallMethod(self, "read",
-                                             "i", DEFAULT_BUFFER_SIZE);
+        _Py_identifier(read);
+        PyObject *data = _PyObject_CallMethodId(self, &PyId_read,
+                                                "i", DEFAULT_BUFFER_SIZE);
         if (!data) {
             Py_DECREF(chunks);
             return NULL;
diff --git a/Modules/_io/textio.c b/Modules/_io/textio.c
index aa29ffb..2ded719 100644
--- a/Modules/_io/textio.c
+++ b/Modules/_io/textio.c
@@ -11,6 +11,24 @@
 #include "structmember.h"
 #include "_iomodule.h"
 
+_Py_identifier(close);
+_Py_identifier(_dealloc_warn);
+_Py_identifier(decode);
+_Py_identifier(device_encoding);
+_Py_identifier(fileno);
+_Py_identifier(flush);
+_Py_identifier(getpreferredencoding);
+_Py_identifier(isatty);
+_Py_identifier(read);
+_Py_identifier(readable);
+_Py_identifier(replace);
+_Py_identifier(reset);
+_Py_identifier(seek);
+_Py_identifier(seekable);
+_Py_identifier(setstate);
+_Py_identifier(tell);
+_Py_identifier(writable);
+
 /* TextIOBase */
 
 PyDoc_STRVAR(textiobase_doc,
@@ -501,8 +519,8 @@
     flag >>= 1;
 
     if (self->decoder != Py_None)
-        return PyObject_CallMethod(self->decoder,
-                                   "setstate", "((OK))", buffer, flag);
+        return _PyObject_CallMethodId(self->decoder,
+                                      &PyId_setstate, "((OK))", buffer, flag);
     else
         Py_RETURN_NONE;
 }
@@ -842,7 +860,7 @@
     if (encoding == NULL) {
         /* Try os.device_encoding(fileno) */
         PyObject *fileno;
-        fileno = PyObject_CallMethod(buffer, "fileno", NULL);
+        fileno = _PyObject_CallMethodId(buffer, &PyId_fileno, NULL);
         /* Ignore only AttributeError and UnsupportedOperation */
         if (fileno == NULL) {
             if (PyErr_ExceptionMatches(PyExc_AttributeError) ||
@@ -854,9 +872,9 @@
             }
         }
         else {
-            self->encoding = PyObject_CallMethod(state->os_module,
-                                                 "device_encoding",
-                                                 "N", fileno);
+            self->encoding = _PyObject_CallMethodId(state->os_module,
+                                                    &PyId_device_encoding,
+                                                    "N", fileno);
             if (self->encoding == NULL)
                 goto error;
             else if (!PyUnicode_Check(self->encoding))
@@ -873,8 +891,8 @@
         }
         else {
           use_locale:
-            self->encoding = PyObject_CallMethod(
-                state->locale_module, "getpreferredencoding", NULL);
+            self->encoding = _PyObject_CallMethodId(
+                state->locale_module, &PyId_getpreferredencoding, NULL);
             if (self->encoding == NULL) {
               catch_ImportError:
                 /*
@@ -939,7 +957,7 @@
 #endif
 
     /* Build the decoder object */
-    res = PyObject_CallMethod(buffer, "readable", NULL);
+    res = _PyObject_CallMethodId(buffer, &PyId_readable, NULL);
     if (res == NULL)
         goto error;
     r = PyObject_IsTrue(res);
@@ -964,7 +982,7 @@
     }
 
     /* Build the encoder object */
-    res = PyObject_CallMethod(buffer, "writable", NULL);
+    res = _PyObject_CallMethodId(buffer, &PyId_writable, NULL);
     if (res == NULL)
         goto error;
     r = PyObject_IsTrue(res);
@@ -1022,7 +1040,7 @@
             Py_DECREF(raw);
     }
 
-    res = PyObject_CallMethod(buffer, "seekable", NULL);
+    res = _PyObject_CallMethodId(buffer, &PyId_seekable, NULL);
     if (res == NULL)
         goto error;
     self->seekable = self->telling = PyObject_IsTrue(res);
@@ -1255,8 +1273,8 @@
             haslf = 1;
 
     if (haslf && self->writetranslate && self->writenl != NULL) {
-        PyObject *newtext = PyObject_CallMethod(
-            text, "replace", "ss", "\n", self->writenl);
+        PyObject *newtext = _PyObject_CallMethodId(
+            text, &PyId_replace, "ss", "\n", self->writenl);
         Py_DECREF(text);
         if (newtext == NULL)
             return NULL;
@@ -1311,7 +1329,7 @@
     Py_CLEAR(self->snapshot);
 
     if (self->decoder) {
-        ret = PyObject_CallMethod(self->decoder, "reset", NULL);
+        ret = _PyObject_CallMethodId(self->decoder, &PyId_reset, NULL);
         if (ret == NULL)
             return NULL;
         Py_DECREF(ret);
@@ -1490,7 +1508,7 @@
 
     if (n < 0) {
         /* Read everything */
-        PyObject *bytes = PyObject_CallMethod(self->buffer, "read", NULL);
+        PyObject *bytes = _PyObject_CallMethodId(self->buffer, &PyId_read, NULL);
         PyObject *decoded;
         if (bytes == NULL)
             goto fail;
@@ -1940,8 +1958,8 @@
     if (cookie->start_pos == 0 && cookie->dec_flags == 0)
         res = PyObject_CallMethodObjArgs(self->decoder, _PyIO_str_reset, NULL);
     else
-        res = PyObject_CallMethod(self->decoder, "setstate",
-                                  "((yi))", "", cookie->dec_flags);
+        res = _PyObject_CallMethodId(self->decoder, &PyId_setstate,
+                                     "((yi))", "", cookie->dec_flags);
     if (res == NULL)
         return -1;
     Py_DECREF(res);
@@ -2005,13 +2023,12 @@
          * sync the underlying buffer with the current position.
          */
         Py_DECREF(cookieObj);
-        cookieObj = PyObject_CallMethod((PyObject *)self, "tell", NULL);
+        cookieObj = _PyObject_CallMethodId((PyObject *)self, &PyId_tell, NULL);
         if (cookieObj == NULL)
             goto fail;
     }
     else if (whence == 2) {
         /* seek relative to end of file */
-
         cmp = PyObject_RichCompareBool(cookieObj, _PyIO_zero, Py_EQ);
         if (cmp < 0)
             goto fail;
@@ -2021,7 +2038,7 @@
             goto fail;
         }
 
-        res = PyObject_CallMethod((PyObject *)self, "flush", NULL);
+        res = _PyObject_CallMethodId((PyObject *)self, &PyId_flush, NULL);
         if (res == NULL)
             goto fail;
         Py_DECREF(res);
@@ -2029,13 +2046,13 @@
         textiowrapper_set_decoded_chars(self, NULL);
         Py_CLEAR(self->snapshot);
         if (self->decoder) {
-            res = PyObject_CallMethod(self->decoder, "reset", NULL);
+            res = _PyObject_CallMethodId(self->decoder, &PyId_reset, NULL);
             if (res == NULL)
                 goto fail;
             Py_DECREF(res);
         }
 
-        res = PyObject_CallMethod(self->buffer, "seek", "ii", 0, 2);
+        res = _PyObject_CallMethodId(self->buffer, &PyId_seek, "ii", 0, 2);
         Py_XDECREF(cookieObj);
         return res;
     }
@@ -2088,8 +2105,8 @@
 
     if (cookie.chars_to_skip) {
         /* Just like _read_chunk, feed the decoder and save a snapshot. */
-        PyObject *input_chunk = PyObject_CallMethod(
-            self->buffer, "read", "i", cookie.bytes_to_feed);
+        PyObject *input_chunk = _PyObject_CallMethodId(
+            self->buffer, &PyId_read, "i", cookie.bytes_to_feed);
         PyObject *decoded;
 
         if (input_chunk == NULL)
@@ -2103,8 +2120,8 @@
             goto fail;
         }
 
-        decoded = PyObject_CallMethod(self->decoder, "decode",
-                                      "Oi", input_chunk, (int)cookie.need_eof);
+        decoded = _PyObject_CallMethodId(self->decoder, &PyId_decode,
+            "Oi", input_chunk, (int)cookie.need_eof);
 
         if (decoded == NULL)
             goto fail;
@@ -2170,12 +2187,12 @@
 
     if (_textiowrapper_writeflush(self) < 0)
         return NULL;
-    res = PyObject_CallMethod((PyObject *)self, "flush", NULL);
+    res = _PyObject_CallMethodId((PyObject *)self, &PyId_flush, NULL);
     if (res == NULL)
         goto fail;
     Py_DECREF(res);
 
-    posobj = PyObject_CallMethod(self->buffer, "tell", NULL);
+    posobj = _PyObject_CallMethodId(self->buffer, &PyId_tell, NULL);
     if (posobj == NULL)
         goto fail;
 
@@ -2229,8 +2246,8 @@
 
     /* TODO: replace assert with exception */
 #define DECODER_DECODE(start, len, res) do { \
-        PyObject *_decoded = PyObject_CallMethod( \
-            self->decoder, "decode", "y#", start, len); \
+        PyObject *_decoded = _PyObject_CallMethodId( \
+            self->decoder, &PyId_decode, "y#", start, len); \
         if (_decoded == NULL) \
             goto fail; \
         assert (PyUnicode_Check(_decoded)); \
@@ -2312,8 +2329,8 @@
     }
     if (input == input_end) {
         /* We didn't get enough decoded data; signal EOF to get more. */
-        PyObject *decoded = PyObject_CallMethod(
-            self->decoder, "decode", "yi", "", /* final = */ 1);
+        PyObject *decoded = _PyObject_CallMethodId(
+            self->decoder, &PyId_decode, "yi", "", /* final = */ 1);
         if (decoded == NULL)
             goto fail;
         assert (PyUnicode_Check(decoded));
@@ -2329,7 +2346,7 @@
     }
 
 finally:
-    res = PyObject_CallMethod(self->decoder, "setstate", "(O)", saved_state);
+    res = _PyObject_CallMethodId(self->decoder, &PyId_setstate, "(O)", saved_state);
     Py_DECREF(saved_state);
     if (res == NULL)
         return NULL;
@@ -2344,7 +2361,7 @@
         PyObject *type, *value, *traceback;
         PyErr_Fetch(&type, &value, &traceback);
 
-        res = PyObject_CallMethod(self->decoder, "setstate", "(O)", saved_state);
+        res = _PyObject_CallMethodId(self->decoder, &PyId_setstate, "(O)", saved_state);
         Py_DECREF(saved_state);
         if (res == NULL)
             return NULL;
@@ -2432,35 +2449,35 @@
 textiowrapper_fileno(textio *self, PyObject *args)
 {
     CHECK_INITIALIZED(self);
-    return PyObject_CallMethod(self->buffer, "fileno", NULL);
+    return _PyObject_CallMethodId(self->buffer, &PyId_fileno, NULL);
 }
 
 static PyObject *
 textiowrapper_seekable(textio *self, PyObject *args)
 {
     CHECK_INITIALIZED(self);
-    return PyObject_CallMethod(self->buffer, "seekable", NULL);
+    return _PyObject_CallMethodId(self->buffer, &PyId_seekable, NULL);
 }
 
 static PyObject *
 textiowrapper_readable(textio *self, PyObject *args)
 {
     CHECK_INITIALIZED(self);
-    return PyObject_CallMethod(self->buffer, "readable", NULL);
+    return _PyObject_CallMethodId(self->buffer, &PyId_readable, NULL);
 }
 
 static PyObject *
 textiowrapper_writable(textio *self, PyObject *args)
 {
     CHECK_INITIALIZED(self);
-    return PyObject_CallMethod(self->buffer, "writable", NULL);
+    return _PyObject_CallMethodId(self->buffer, &PyId_writable, NULL);
 }
 
 static PyObject *
 textiowrapper_isatty(textio *self, PyObject *args)
 {
     CHECK_INITIALIZED(self);
-    return PyObject_CallMethod(self->buffer, "isatty", NULL);
+    return _PyObject_CallMethodId(self->buffer, &PyId_isatty, NULL);
 }
 
 static PyObject *
@@ -2479,7 +2496,7 @@
     self->telling = self->seekable;
     if (_textiowrapper_writeflush(self) < 0)
         return NULL;
-    return PyObject_CallMethod(self->buffer, "flush", NULL);
+    return _PyObject_CallMethodId(self->buffer, &PyId_flush, NULL);
 }
 
 static PyObject *
@@ -2502,20 +2519,20 @@
     }
     else {
         if (self->deallocating) {
-            res = PyObject_CallMethod(self->buffer, "_dealloc_warn", "O", self);
+            res = _PyObject_CallMethodId(self->buffer, &PyId__dealloc_warn, "O", self);
             if (res)
                 Py_DECREF(res);
             else
                 PyErr_Clear();
         }
-        res = PyObject_CallMethod((PyObject *)self, "flush", NULL);
+        res = _PyObject_CallMethodId((PyObject *)self, &PyId_flush, NULL);
         if (res == NULL) {
             return NULL;
         }
         else
             Py_DECREF(res);
 
-        return PyObject_CallMethod(self->buffer, "close", NULL);
+        return _PyObject_CallMethodId(self->buffer, &PyId_close, NULL);
     }
 }
 
diff --git a/Modules/_pickle.c b/Modules/_pickle.c
index 0b10009..e53abc8 100644
--- a/Modules/_pickle.c
+++ b/Modules/_pickle.c
@@ -2488,7 +2488,9 @@
             status = batch_dict_exact(self, obj);
             Py_LeaveRecursiveCall();
         } else {
-            items = PyObject_CallMethod(obj, "items", "()");
+            _Py_identifier(items);
+
+            items = _PyObject_CallMethodId(obj, &PyId_items, "()");
             if (items == NULL)
                 goto error;
             iter = PyObject_GetIter(items);
@@ -3774,8 +3776,10 @@
 static PyObject *
 find_class(UnpicklerObject *self, PyObject *module_name, PyObject *global_name)
 {
-    return PyObject_CallMethod((PyObject *)self, "find_class", "OO",
-                               module_name, global_name);
+    _Py_identifier(find_class);
+
+    return _PyObject_CallMethodId((PyObject *)self, &PyId_find_class, "OO",
+                                  module_name, global_name);
 }
 
 static Py_ssize_t
@@ -4388,7 +4392,9 @@
         result = PyObject_CallObject(cls, args);
     }
     else {
-        result = PyObject_CallMethod(cls, "__new__", "O", cls);
+        _Py_identifier(__new__);
+
+        result = _PyObject_CallMethodId(cls, &PyId___new__, "O", cls);
     }
     return result;
 }
diff --git a/Modules/_posixsubprocess.c b/Modules/_posixsubprocess.c
index bc2f72c..e6a9283 100644
--- a/Modules/_posixsubprocess.c
+++ b/Modules/_posixsubprocess.c
@@ -18,7 +18,9 @@
 static int _enable_gc(PyObject *gc_module)
 {
     PyObject *result;
-    result = PyObject_CallMethod(gc_module, "enable", NULL);
+    _Py_identifier(enable);
+
+    result = _PyObject_CallMethodId(gc_module, &PyId_enable, NULL);
     if (result == NULL)
         return 1;
     Py_DECREF(result);
@@ -249,10 +251,13 @@
     /* We need to call gc.disable() when we'll be calling preexec_fn */
     if (preexec_fn != Py_None) {
         PyObject *result;
+        _Py_identifier(isenabled);
+        _Py_identifier(disable);
+        
         gc_module = PyImport_ImportModule("gc");
         if (gc_module == NULL)
             return NULL;
-        result = PyObject_CallMethod(gc_module, "isenabled", NULL);
+        result = _PyObject_CallMethodId(gc_module, &PyId_isenabled, NULL);
         if (result == NULL) {
             Py_DECREF(gc_module);
             return NULL;
@@ -263,7 +268,7 @@
             Py_DECREF(gc_module);
             return NULL;
         }
-        result = PyObject_CallMethod(gc_module, "disable", NULL);
+        result = _PyObject_CallMethodId(gc_module, &PyId_disable, NULL);
         if (result == NULL) {
             Py_DECREF(gc_module);
             return NULL;
diff --git a/Modules/_sqlite/connection.c b/Modules/_sqlite/connection.c
index 310a27c..c2f218f 100644
--- a/Modules/_sqlite/connection.c
+++ b/Modules/_sqlite/connection.c
@@ -675,6 +675,7 @@
 {
     PyObject* function_result = NULL;
     PyObject** aggregate_instance;
+    _Py_identifier(finalize);
 
 #ifdef WITH_THREAD
     PyGILState_STATE threadstate;
@@ -690,7 +691,7 @@
         goto error;
     }
 
-    function_result = PyObject_CallMethod(*aggregate_instance, "finalize", "");
+    function_result = _PyObject_CallMethodId(*aggregate_instance, &PyId_finalize, "");
     if (!function_result) {
         if (_enable_callback_tracebacks) {
             PyErr_Print();
@@ -1230,8 +1231,9 @@
     PyObject* cursor = 0;
     PyObject* result = 0;
     PyObject* method = 0;
+    _Py_identifier(cursor);
 
-    cursor = PyObject_CallMethod((PyObject*)self, "cursor", "");
+    cursor = _PyObject_CallMethodId((PyObject*)self, &PyId_cursor, "");
     if (!cursor) {
         goto error;
     }
@@ -1259,8 +1261,9 @@
     PyObject* cursor = 0;
     PyObject* result = 0;
     PyObject* method = 0;
+    _Py_identifier(cursor);
 
-    cursor = PyObject_CallMethod((PyObject*)self, "cursor", "");
+    cursor = _PyObject_CallMethodId((PyObject*)self, &PyId_cursor, "");
     if (!cursor) {
         goto error;
     }
@@ -1288,8 +1291,9 @@
     PyObject* cursor = 0;
     PyObject* result = 0;
     PyObject* method = 0;
+    _Py_identifier(cursor);
 
-    cursor = PyObject_CallMethod((PyObject*)self, "cursor", "");
+    cursor = _PyObject_CallMethodId((PyObject*)self, &PyId_cursor, "");
     if (!cursor) {
         goto error;
     }
@@ -1437,6 +1441,7 @@
     PyObject* name;
     PyObject* retval;
     Py_ssize_t i, len;
+    _Py_identifier(upper);
     char *uppercase_name_str;
     int rc;
     unsigned int kind;
@@ -1450,7 +1455,7 @@
         goto finally;
     }
 
-    uppercase_name = PyObject_CallMethod(name, "upper", "");
+    uppercase_name = _PyObject_CallMethodId(name, &PyId_upper, "");
     if (!uppercase_name) {
         goto finally;
     }
diff --git a/Modules/_sqlite/cursor.c b/Modules/_sqlite/cursor.c
index 264ae45..b47fed4 100644
--- a/Modules/_sqlite/cursor.c
+++ b/Modules/_sqlite/cursor.c
@@ -150,8 +150,9 @@
 {
     PyObject* upcase_key;
     PyObject* retval;
+    _Py_identifier(upper);
 
-    upcase_key = PyObject_CallMethod(key, "upper", "");
+    upcase_key = _PyObject_CallMethodId(key, &PyId_upper, "");
     if (!upcase_key) {
         return NULL;
     }
diff --git a/Modules/_sqlite/microprotocols.c b/Modules/_sqlite/microprotocols.c
index c730afa..c0f5e22 100644
--- a/Modules/_sqlite/microprotocols.c
+++ b/Modules/_sqlite/microprotocols.c
@@ -95,7 +95,9 @@
 
     /* try to have the protocol adapt this object*/
     if (PyObject_HasAttrString(proto, "__adapt__")) {
-        PyObject *adapted = PyObject_CallMethod(proto, "__adapt__", "O", obj);
+        _Py_identifier(__adapt__);
+        PyObject *adapted = _PyObject_CallMethodId(proto, &PyId___adapt__, "O", obj);
+
         if (adapted) {
             if (adapted != Py_None) {
                 return adapted;
@@ -110,7 +112,9 @@
 
     /* and finally try to have the object adapt itself */
     if (PyObject_HasAttrString(obj, "__conform__")) {
-        PyObject *adapted = PyObject_CallMethod(obj, "__conform__","O", proto);
+        _Py_identifier(__conform__);
+        PyObject *adapted = _PyObject_CallMethodId(obj, &PyId___conform__,"O", proto);
+
         if (adapted) {
             if (adapted != Py_None) {
                 return adapted;
diff --git a/Modules/_sqlite/module.c b/Modules/_sqlite/module.c
index cbc3b8e..20e1ec7 100644
--- a/Modules/_sqlite/module.c
+++ b/Modules/_sqlite/module.c
@@ -179,13 +179,14 @@
     PyObject* name = NULL;
     PyObject* callable;
     PyObject* retval = NULL;
+    _Py_identifier(upper);
 
     if (!PyArg_ParseTuple(args, "UO", &orig_name, &callable)) {
         return NULL;
     }
 
     /* convert the name to upper case */
-    name = PyObject_CallMethod(orig_name, "upper", "");
+    name = _PyObject_CallMethodId(orig_name, &PyId_upper, "");
     if (!name) {
         goto error;
     }
diff --git a/Modules/arraymodule.c b/Modules/arraymodule.c
index 0032594..6cedee4 100644
--- a/Modules/arraymodule.c
+++ b/Modules/arraymodule.c
@@ -1253,6 +1253,7 @@
     PyObject *f, *b, *res;
     Py_ssize_t itemsize = self->ob_descr->itemsize;
     Py_ssize_t n, nbytes;
+    _Py_identifier(read);
     int not_enough_bytes;
 
     if (!PyArg_ParseTuple(args, "On:fromfile", &f, &n))
@@ -1264,7 +1265,7 @@
         return NULL;
     }
 
-    b = PyObject_CallMethod(f, "read", "n", nbytes);
+    b = _PyObject_CallMethodId(f, &PyId_read, "n", nbytes);
     if (b == NULL)
         return NULL;
 
@@ -1321,12 +1322,14 @@
         char* ptr = self->ob_item + i*BLOCKSIZE;
         Py_ssize_t size = BLOCKSIZE;
         PyObject *bytes, *res;
+        _Py_identifier(write);
+
         if (i*BLOCKSIZE + size > nbytes)
             size = nbytes - i*BLOCKSIZE;
         bytes = PyBytes_FromStringAndSize(ptr, size);
         if (bytes == NULL)
             return NULL;
-        res = PyObject_CallMethod(f, "write", "O", bytes);
+        res = _PyObject_CallMethodId(f, &PyId_write, "O", bytes);
         Py_DECREF(bytes);
         if (res == NULL)
             return NULL;
diff --git a/Modules/cjkcodecs/multibytecodec.c b/Modules/cjkcodecs/multibytecodec.c
index 1b37845..8635a56 100644
--- a/Modules/cjkcodecs/multibytecodec.c
+++ b/Modules/cjkcodecs/multibytecodec.c
@@ -1579,12 +1579,13 @@
                       PyObject *unistr)
 {
     PyObject *str, *wr;
+    _Py_identifier(write);
 
     str = encoder_encode_stateful(STATEFUL_ECTX(self), unistr, 0);
     if (str == NULL)
         return -1;
 
-    wr = PyObject_CallMethod(self->stream, "write", "O", str);
+    wr = _PyObject_CallMethodId(self->stream, &PyId_write, "O", str);
     Py_DECREF(str);
     if (wr == NULL)
         return -1;
@@ -1650,7 +1651,9 @@
     assert(PyBytes_Check(pwrt));
     if (PyBytes_Size(pwrt) > 0) {
         PyObject *wr;
-        wr = PyObject_CallMethod(self->stream, "write", "O", pwrt);
+        _Py_identifier(write);
+
+        wr = _PyObject_CallMethodId(self->stream, &PyId_write, "O", pwrt);
         if (wr == NULL) {
             Py_DECREF(pwrt);
             return NULL;
diff --git a/Modules/faulthandler.c b/Modules/faulthandler.c
index 06f7f2e..11d5340 100644
--- a/Modules/faulthandler.c
+++ b/Modules/faulthandler.c
@@ -146,6 +146,8 @@
 faulthandler_get_fileno(PyObject *file, int *p_fd)
 {
     PyObject *result;
+    _Py_identifier(fileno);
+    _Py_identifier(flush);
     long fd_long;
     int fd;
 
@@ -157,7 +159,7 @@
         }
     }
 
-    result = PyObject_CallMethod(file, "fileno", "");
+    result = _PyObject_CallMethodId(file, &PyId_fileno, "");
     if (result == NULL)
         return NULL;
 
@@ -175,7 +177,7 @@
         return NULL;
     }
 
-    result = PyObject_CallMethod(file, "flush", "");
+    result = _PyObject_CallMethodId(file, &PyId_flush, "");
     if (result != NULL)
         Py_DECREF(result);
     else {
@@ -1197,6 +1199,7 @@
 faulthandler_env_options(void)
 {
     PyObject *xoptions, *key, *module, *res;
+    _Py_identifier(enable);
 
     if (!Py_GETENV("PYTHONFAULTHANDLER")) {
         int has_key;
@@ -1219,7 +1222,7 @@
     if (module == NULL) {
         return -1;
     }
-    res = PyObject_CallMethod(module, "enable", "");
+    res = _PyObject_CallMethodId(module, &PyId_enable, "");
     Py_DECREF(module);
     if (res == NULL)
         return -1;
diff --git a/Modules/gcmodule.c b/Modules/gcmodule.c
index b05675c..2533de6 100644
--- a/Modules/gcmodule.c
+++ b/Modules/gcmodule.c
@@ -769,7 +769,9 @@
 {
     double result = 0;
     if (tmod != NULL) {
-        PyObject *f = PyObject_CallMethod(tmod, "time", NULL);
+        _Py_identifier(time);
+
+        PyObject *f = _PyObject_CallMethodId(tmod, &PyId_time, NULL);
         if (f == NULL) {
             PyErr_Clear();
         }
diff --git a/Modules/itertoolsmodule.c b/Modules/itertoolsmodule.c
index d0897c3..4f81fe2 100644
--- a/Modules/itertoolsmodule.c
+++ b/Modules/itertoolsmodule.c
@@ -654,7 +654,9 @@
         copyable = it;
     PyTuple_SET_ITEM(result, 0, copyable);
     for (i=1 ; i<n ; i++) {
-        copyable = PyObject_CallMethod(copyable, "__copy__", NULL);
+        _Py_identifier(__copy__);
+
+        copyable = _PyObject_CallMethodId(copyable, &PyId___copy__, NULL);
         if (copyable == NULL) {
             Py_DECREF(result);
             return NULL;
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index 5d086a7..f4a80c2 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -702,7 +702,9 @@
 static PyObject *
 mmap__exit__method(PyObject *self, PyObject *args)
 {
-    return PyObject_CallMethod(self, "close", NULL);
+    _Py_identifier(close);
+
+    return _PyObject_CallMethodId(self, &PyId_close, NULL);
 }
 
 static struct PyMethodDef mmap_object_methods[] = {
diff --git a/Modules/ossaudiodev.c b/Modules/ossaudiodev.c
index f0fe8c2..7512c1d 100644
--- a/Modules/ossaudiodev.c
+++ b/Modules/ossaudiodev.c
@@ -534,7 +534,9 @@
 static PyObject *
 oss_exit(PyObject *self, PyObject *unused)
 {
-    PyObject *ret = PyObject_CallMethod(self, "close", NULL);
+    _Py_identifier(close);
+
+    PyObject *ret = _PyObject_CallMethodId(self, &PyId_close, NULL);
     if (!ret)
         return NULL;
     Py_DECREF(ret);
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index e64c960..6d0a44c 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -4821,7 +4821,9 @@
     if (hobj == Py_None) {
         hptr = NULL;
     } else if (PyUnicode_Check(hobj)) {
-        idna = PyObject_CallMethod(hobj, "encode", "s", "idna");
+        _Py_identifier(encode);
+
+        idna = _PyObject_CallMethodId(hobj, &PyId_encode, "s", "idna");
         if (!idna)
             return NULL;
         assert(PyBytes_Check(idna));
diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index 4dc82a0..2ea0247 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -535,11 +535,12 @@
 {
     PyObject *strptime_module = PyImport_ImportModuleNoBlock("_strptime");
     PyObject *strptime_result;
+    _Py_identifier(_strptime_time);
 
     if (!strptime_module)
         return NULL;
-    strptime_result = PyObject_CallMethod(strptime_module,
-                                            "_strptime_time", "O", args);
+    strptime_result = _PyObject_CallMethodId(strptime_module,
+                                             &PyId__strptime_time, "O", args);
     Py_DECREF(strptime_module);
     return strptime_result;
 }