https://bugs.freedesktop.org/show_bug.cgi?id=39202
--- Comment #6 from Michel Dänzer michel@daenzer.net 2011-08-09 04:15:45 PDT --- (In reply to comment #6)
2.6.38 -> 60 to 120 FPS with vsync on
vsync can't actually be effective if the framerate is higher than the refresh rate...
Does
Option "EnablePageFlip" "off"
and possibly also
Option "SwapbuffersWait" "off"
restore the previous performance?