Re: Low redisplay performance (23 regression)

[Tassilo Horn]

Chong Yidong <address@hidden> writes:

Hi!

>> And on yet another related note, today I've found out that after
>> changing the font scale for the current buffer using `C-x C-+' or
>> `C-x C--' line-by-line scrolling slows down considerably.
>
> On further investigation, I found that the problem can be solved with
> a relatively safe change to handle_face_prop, so that it tells
> face_at_buffer_position what the base face id is rather than having
> face_at_buffer_position recalculate it each time the redisplay loop
> wants to display the next face (!).  I've checked in the fix.

Yes, it's much better now.  Before line-by-line scrolling in
`list-faces-display' with face-remapping was nearly impossible, now it's
not much slower than without it.

Thanks,
Tassilo