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Re: slowness scrolling in *Help* windows

From: Andreas Schwab
Subject: Re: slowness scrolling in *Help* windows
Date: Mon, 08 Sep 2014 20:05:11 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.93 (gnu/linux)

"Perry E. Metzger" <address@hidden> writes:

> I've been noticing that sometimes scrolling in *Help* gets very, very
> slow sometimes. Typical case: C-h s (that is, view the syntax table),
> and scroll through it, and it can take seconds for the screen to do
> something after C-v

Emacs needs to look up the fonts for the characters in the buffer.  That
can take some time depending on the number of installed fonts.

> It is possible this is only happening if there are loads of "unusual"
> Unicode characters in the buffer in question. I don't have any good
> very long files of lots of Unicode characters to check if it is
> happening on all buffers, or just *Help* buffers.

It happens for any buffer that contains many different characters from
unusual scripts.  Try scrolling through the buffer generated by
mule-diag for an extreme example.


Andreas Schwab, address@hidden
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

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