Document latest optimizations using _PyBytesWriter
diff --git a/Doc/whatsnew/3.6.rst b/Doc/whatsnew/3.6.rst
index b735e9c..d1e5045 100644
--- a/Doc/whatsnew/3.6.rst
+++ b/Doc/whatsnew/3.6.rst
@@ -141,16 +141,25 @@
=============
* The ASCII decoder is now up to 60 times as fast for error handlers:
- ``surrogateescape``, ``ignore`` and ``replace``.
+ ``surrogateescape``, ``ignore`` and ``replace`` (Contributed
+ by Victor Stinner in :issue:`24870`).
* The ASCII and the Latin1 encoders are now up to 3 times as fast for the error
- error ``surrogateescape``.
+ error ``surrogateescape`` (Contributed by Victor Stinner in :issue:`25227`).
* The UTF-8 encoder is now up to 75 times as fast for error handlers:
- ``ignore``, ``replace``, ``surrogateescape``, ``surrogatepass``.
+ ``ignore``, ``replace``, ``surrogateescape``, ``surrogatepass`` (Contributed
+ by Victor Stinner in :issue:`25267`).
* The UTF-8 decoder is now up to 15 times as fast for error handlers:
- ``ignore``, ``replace`` and ``surrogateescape``.
+ ``ignore``, ``replace`` and ``surrogateescape`` (Contributed
+ by Victor Stinner in :issue:`25301`).
+
+* ``bytes % args`` is now up to 2 times faster. (Contributed by Victor Stinner
+ in :issue:`25349`).
+
+* ``bytearray % args`` is now between 2.5 and 5 times faster. (Contributed by
+ Victor Stinner in :issue:`25399`).
Build and C API Changes
diff --git a/Misc/NEWS b/Misc/NEWS
index 2700ad3..97e5e77 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@
Core and Builtins
-----------------
+- Issue #25399: Optimize bytearray % args using the new private _PyBytesWriter
+ API. Formatting is now between 2.5 and 5 times faster.
+
- Issue #25274: sys.setrecursionlimit() now raises a RecursionError if the new
recursion limit is too low depending at the current recursion depth. Modify
also the "lower-water mark" formula to make it monotonic. This mark is used
@@ -19,6 +22,7 @@
sys.stdout.fileno() fails.
- Issue #25349: Optimize bytes % args using the new private _PyBytesWriter API.
+ Formatting is now up to 2 times faster.
- Issue #24806: Prevent builtin types that are not allowed to be subclassed from
being subclassed through multiple inheritance.