Re: slowness scrolling in *Help* windows

[Andreas Schwab]

"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.

-- 
Andreas Schwab, address@hidden
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