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bug#11545: 24.0.96-mac-2.92; Strange speed problem scrolling in C++ code
From: |
John Wiegley |
Subject: |
bug#11545: 24.0.96-mac-2.92; Strange speed problem scrolling in C++ code |
Date: |
Mon, 28 May 2012 18:05:15 -0500 |
User-agent: |
Gnus/5.130006 (Ma Gnus v0.6) Emacs/23.4 (darwin) |
>>>>> John Wiegley <jwiegley@gmail.com> writes:
>>>>>> YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp> writes:
>> With the Time Profiler in Instrument.app, I found that fontification
>> of CC Mode in Emacs 24 is much heavier and causes frequent GCs than
>> that in Emacs 23. Please try the following:
>>
>> 1. Start Emacs 24 Mac port with -Q (alternatively, pressing the
>> shift key.)
>> 2. M-x load-file PREFIX/share/emacs/23.4/lisp/progmodes/cc-fonts.elc
>> RTE.
>> 3. Replay scrolling a large C++ file.
>>
>> I'm not sure if this slowdown is intended or expected.
>
> Indeed, this makes the speed situation much better on Emacs 24.0.97.
I can now confirm that loading CC-Mode 5.32.3 into Emacs 23.4 causes the
identical speed issues that I was seeing with Emacs 24.0.97, so this is a
performance issue in the latest CC-Mode, not a bug in Emacs 24 or with
Mac-Port Emacs.
To the CC-Mode maintainers: is there a way to disable the slower, "more
correct" mode in the latest CC-Mode, and go back to the entirely sufficient
(for me) mode of previous versions?
Thanks,
John
bug#11545: 24.0.96-mac-2.92; Strange speed problem scrolling in C++ code,
John Wiegley <=