Looks like a UXA versus SNA problem. https://wiki.ubuntu.com/X/Testing/IntelSNA
~$ grep "SNA init" /var/log/Xorg.0.log [ 47.176] (II) intel(0): SNA initialized with gen3 backend The default is SNA, which is fast, until something goes wrong, then it gets really slow. If I start with UXA, it is slow from the beginning. I assume that under 12.10, intel graphics was using UXA, and performance was reasonable. Under 13.04, UXA is unusable. SNA is fast, but unstable. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1189645 Title: General lag under desktop environments To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/flashplugin-nonfree/+bug/1189645/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
