Comment 16 for bug 291053

Created an attachment (id=20120)
disable upload to screen

(In reply to comment #9)
> Hmm, no, it doesn't look like I do.
>
> However, a few (perhaps significant) variables change when I do this:
> * Metacity instead of Compiz (fallback), no compositing
> * EXA + no-DRI seems to be a very no-go combination performance-wise :). I'm
> not able to switch very fast between cursor themes because X is sluggish. But
> this is perhaps not significant for reproducing. It might just be enough that
> the theme is actually altered, no matter how fast.
>

It's not supposed to be performant :)
I think there may be an issue with the Upload to screen hook. See if you still get corruption with the DRI enabled with metacity or enable DRI and try the attached patch.