https://bugs.freedesktop.org/show_bug.cgi?id=80419
--- Comment #49 from Alassane Maiga azou8506@gmail.com --- Hello, I created an account because 2 days ago I was having the same issue and wanted to provide my dmesg. But when I was trying to reproduce the issue yesterday, I couldn't... I played for hours and the performance was actually quite good. I am with fedora 22 on KDE 5 now, and I did perform some updates before trying again... The other thing I did was disable the option to suspend compositing for full screen windows. Not sure what fixed it though