Add mention of decoding optimizations in the what's new document.

pitrou · pitrou · commit 5cec9d2ae57d · 2012-05-17T17:37:02.000+02:00
diff --git a/Doc/whatsnew/3.3.rst b/Doc/whatsnew/3.3.rst
@@ -1260,6 +1260,10 @@ Major performance enhancements have been added:
   * repeating a single ASCII letter and getting a substring of a ASCII strings
     is 4 times faster
 
+* UTF-8 and UTF-16 decoding is now 2x to 4x faster.
+
+  (contributed by Serhiy Storchaka, :issue:`14624` and :issue:`14738`.)
+
 
 Build and C API Changes
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