bpo-30040: update news entry (GH-12324)

This optimization is not only for space, but also for speed.
7 years ago · 3fe7fa316f
1 changed files with 2 additions and 1 deletions
--- a/Builtins/2019-03-11-22-30-56.bpo-30040.W9z8X7.rst
+++ b/Builtins/2019-03-11-22-30-56.bpo-30040.W9z8X7.rst
@ -1,2 +1,3 @@
 New empty dict uses fewer memory for now.  It used more memory than empty
-dict created by ``dict.clear()``.  Patch by Inada Naoki.
+dict created by ``dict.clear()``.  And empty dict creation and deletion
+is about 2x faster.  Patch by Inada Naoki.