Bug report for 185.18.10: xvideo stuttering
Even on single monitor single screen X with composite disabled, xvideo gets "stuck" and stutters every few seconds or so. Using gl to display video is ok but still gets stuck sometimes. The problem only gets worse when compiz is enabled.
This is a regression from 180.60 which works perfectly. I can run tests/post debug output/whatever to help solve the problem if you like.