https://bugs.freedesktop.org/show_bug.cgi?id=39572
--- Comment #6 from Sven Arvidsson sa@whiz.se 2011-07-29 05:23:56 PDT --- (In reply to comment #5)
This experimental patch should help with performance in cogs, though it needs more work and testing. I'm not sure if it's the right way to implement such optimization at all.
It seems to work fine here. There's a night-and-day difference with and without this patch!