PEP 683: Update the Perf Regression With the Final Benchmark Results (#3519)

Author: ericsnowcurrently

peps/pep-0683.rst

@@ -230,20 +230,17 @@ those described above in `Motivation`_, reflect this improvement.
 Performance
 -----------
 
-A naive implementation shows `a 4% slowdown`_.  We have demonstrated
-a return to ~performance-neutral~ with a handful of basic mitigations
-applied.  See the `mitigations`_ section below.
+A naive implementation shows `a 2% slowdown`_ (3% with MSVC).
+We have demonstrated a return to ~performance-neutral~ with a handful
+of basic mitigations applied.  See the `mitigations`_ section below.
+
+.. _a 2% slowdown: https://github.com/python/cpython/pull/19474#issuecomment-1502245844
 
 On the positive side, immortal objects save a significant amount of
 memory when used `with a pre-fork model <Facebook>`_.  Also, immortal
 objects provide opportunities for specialization in the eval loop that
 would improve performance.
 
-.. _a 4% slowdown: https://github.com/python/cpython/pull/19474#issuecomment-1032944709
-
-TODO: Update the performance impact for the latest branch
-(both for GCC and for clang).
-
 Backward Compatibility
 ----------------------