Date: Thu, 10 Jun 2021 16:46:11 +0000
Cc: dancol@dancol.org, monnier@iro.umontreal.ca, rudalics@gmx.at,
emacs-devel@gnu.org, rms@gnu.org
From: Alan Mackenzie <acm@muc.de>
That variable is still supported by CC Mode (with the exception of AWK
Mode, where it surely is not needed).
Does it make a difference, performance-wise? If not (which is what
ISTR), then that variable isn't really "supported", because supporting
it means that different values of it cause tangible differences in
performance.
Yes, it does make a difference. On my machine, the times to scroll
through xdisp.c with my favourite benchmark for
font-lock-maximum-decoration set to 3, 2, 1 are 23s, 7.5s, 5.5s.