Re: Low redisplay performance (23 regression)

[Deniz Dogan]

2009/4/20 David Reitter <address@hidden>:
> I've been noticing a substantial slowdown in redisplay performance.
>  Scrolling down emacs.c in fundamental-mode takes about 2 seconds in Emacs
> 22 (Carbon port), and 3 seconds in Emacs 23 (NS port).
>
> With font-lock-mode (in c-mode) enabled, the difference is even larger:
>
> About 2.5 seconds in Emacs 22, and more than 7 seconds in 23/NS.
>
> The effect interacts with the display of overlays etc. in the header line.
>  When turning that off, I get about 2.5 seconds in Emacs 22, and still more
> than 4 seconds in 23/NS.  (All values estimated manually from several
> tries.)
>
> I'm wondering if others get the same on other platforms comparing 22 and 23,
> or if this is a problem specifically in the NS port (for example, with
> setting drawing color or the like).

I haven't really done any real testing, but I recall the difference
being quite noticable when I switched from 22 to 23.

--
Deniz Dogan