https://bugs.freedesktop.org/show_bug.cgi?id=89203

--- Comment #9 from andre35822@yahoo.com --- The issue seems to no longer occur on Mesa 10.5.4, I am also on kernel 4.0 (I dont remember if it did not occur on Mesa 10.5.4 with kernel 3.19)

I guess this is solved? I don't know what was done to solve it but the stuttering no longer occurs and FPS has increased by 10-20FPS.