bpo-41006: Document the runpy optimization (pythonGH-20953)

vstinner · web-flow · commit 4c18fc8f1def · 2020-06-17T23:58:58.000+02:00
diff --git a/Doc/whatsnew/3.10.rst b/Doc/whatsnew/3.10.rst
@@ -103,6 +103,11 @@ Improved Modules
 Optimizations
 =============
 
+* The :mod:`runpy` module now imports less modules.
+  The ``python3 -m module-name`` command startup time is 1.3x faster in
+  average.
+  (Contributed by Victor Stinner in :issue:`41006`.)
+
 
 Deprecated
 ==========
