From: Chong Yidong <cyd@gnu.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 10835@debbugs.gnu.org
Subject: bug#10835: 24.0.93; bidi-paragraph-direction slows down Shell mode
Date: Sat, 18 Feb 2012 10:28:12 +0800 [thread overview]
Message-ID: <87y5s0yiwz.fsf@gnu.org> (raw)
In-Reply-To: <8362f5wc15.fsf@gnu.org> (Eli Zaretskii's message of "Fri, 17 Feb 2012 20:27:34 +0200")
I just noticed that when I do `ls --color=no' rather than just `ls',
insertion and scrolling are very fast. The sluggishness only appears
when ls color highlighting is enabled. So the inefficiency of
ansi-color.el, and its use of overlays, seems to play a role.
Eli Zaretskii <eliz@gnu.org> writes:
> What does "time ls /usr/share/doc" say, when you run it from the shell
> buffer? What are the times it reports, and are they approximately the
> same in each of the 4 invocations?
Times are below. Another observation: with `time ls /usr/share/doc'
(which does use color highlighting), scrolling through the Shell buffer
is no longer sluggish. I think the output of `time' helps by providing
a paragraph break.
If I do plain `ls' (no `time'), then go back and edit the Shell buffer
manually by adding a C-q C-j line break after each prompt, that also
makes the scrolling sluggishness go away.
In xterm (speed is the same after repeated invocations):
real 0m0.148s
user 0m0.008s
sys 0m0.020s
In xterm, with --color=no:
real 0m0.039s
user 0m0.004s
sys 0m0.008s
In the Emacs 23 shell buffer, on the first invocation:
real 0m0.378s
user 0m0.008s
sys 0m0.008s
In the Emacs 24 shell buffer, on the first invocation:
real 0m0.866s
user 0m0.008s
sys 0m0.004s
In the Emacs 24 shell buffer, after 10 invocations:
real 0m1.969s
user 0m0.008s
sys 0m0.004s
In the Emacs 24 shell buffer, with --color=no:
real 0m0.296s
user 0m0.000s
sys 0m0.008s
In the Emacs 24 shell buffer, with --color=no, after 10 invocations:
real 0m0.280s
user 0m0.004s
sys 0m0.012s
next prev parent reply other threads:[~2012-02-18 2:28 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-17 5:41 bug#10835: 24.0.93; bidi-paragraph-direction slows down Shell mode Chong Yidong
2012-02-17 5:48 ` Chong Yidong
2012-02-17 8:21 ` Andreas Schwab
2012-02-17 13:42 ` Chong Yidong
2012-02-17 16:08 ` Eli Zaretskii
2012-02-17 17:39 ` Chong Yidong
2012-02-17 18:27 ` Eli Zaretskii
2012-02-18 2:28 ` Chong Yidong [this message]
2012-02-18 3:37 ` Chong Yidong
2012-02-18 8:49 ` Eli Zaretskii
2012-02-18 14:14 ` Eli Zaretskii
2012-02-19 14:07 ` Chong Yidong
2012-02-18 8:27 ` Eli Zaretskii
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