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