Thanks, I pushed the attached patch, which also mentions a downgrade.
>From 21dad0c6ac46846fbee6eabbb736dfe87fbac508 Mon Sep 17 00:00:00 2001 From: Paul Eggert <[email protected]> Date: Tue, 6 May 2014 09:22:48 -0700 Subject: [PATCH] doc: mention performance changes
* NEWS: Discuss recent performance improvements and downgrades. --- NEWS | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/NEWS b/NEWS index 7269d57..3a20096 100644 --- a/NEWS +++ b/NEWS @@ -44,6 +44,12 @@ GNU grep NEWS -*- outline -*- 'grep -i Ç' now matches both 'Ç' (U+01C7 LATIN CAPITAL LETTER LJ) and 'Ç' (U+01C9 LATIN SMALL LETTER LJ). +** Improvements + + Performance has improved, typically by 10% and in some cases by a + factor of 200. However, performance of grep -P in UTF-8 locales has + gotten worse as part of the fix for the abovementioned crashes. + * Noteworthy changes in release 2.18 (2014-02-20) [stable] -- 1.9.0
