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bug#15390: 24.3; scrolling in emacs,w32 uses 100% cpu
From: |
Eli Zaretskii |
Subject: |
bug#15390: 24.3; scrolling in emacs,w32 uses 100% cpu |
Date: |
Mon, 16 Sep 2013 10:13:59 +0300 |
> Date: Mon, 16 Sep 2013 09:41:52 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 15390@debbugs.gnu.org
>
> Emacs 24's display performance is sensitive to the paragraph length as
> well. A paragraph start and end are defined for this purpose as empty
> lines. Is it possible that the text files you used didn't have any
> empty lines at all? If so, can you try files that do have empty
> lines?
In addition, the characters that begin a paragraph might be of
importance. You say "text file", so I presume that is human-readable
text, but it could also be a file with many digits and punctuation
characters -- these make redisplay work harder.
IOW, please show some representative portion(s) of the file(s) in
question, or perhaps even the entire file, if you can share it.
> I can only see performance similar to what you report on a laptop with
> a Core i3-2328M at 2.2 GHz (running Windows 7 64-bit), a much slower
> machine. I will try later on a desktop Windows 7 machine.
Did that, and saw 20% to 30% CPU load, on a system that is powered by
a Core 2 Duo CPU, clearly much slower than yours.
Bottom line: I'm quite sure the file(s) you are using somehow hit the
display engine in its underbelly.