Minimal X Config File and Compiz

David Nielsen david at
Wed Sep 13 20:07:59 UTC 2006

ons, 13 09 2006 kl. 15:49 -0400, skrev Kristian Høgsberg:
> David Nielsen wrote:
> ...
> >>> Did you solve the Firefox scrolling issue with compiz on an r300 based 
> >>> card? Firefox becomes unusably slow over here (Radeon 9500pro) when I 
> >>> switch to compiz but the effects themselves work smoothly.
> >>>
> >>> Regards,
> >>>    Dennis
> >>>
> >> I see the same thing with the R100. Firefox scrolling is unbearable and
> >> so is gnome-terminal scrolling, especially full screen.
> > 
> > Admittedly that one is rather bad but it only happens if you scroll
> > using the mouse wheel not if you grap the scrollbar - I'm thinking
> > pango?
> I know everybody likes to kick pango, but this is not pango's fault.  The 
> problem is that when we run compiz on AIGLX, we kick out all pixmaps to host 
> memory.  This means that XCopyArea (which is what drives most scrolling) is no 
> longer accelerated and furthermore, for each line you scroll, we have to copy 
> the pixmap contents back out to the card.  This is the big bottleneck in the 
> compiz+AIGLX architecture, we're hoping to fix it post-fc6.
> Kristian

Damn you Kristian for ruining a perfectly good pango bashing with things
like an informed opinion and the truth on your side.. :)

but I'm glad to see that the problem is being worked on.

- David

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