Finally, I've found a solution that works for me: updating my proprietary NVidia drivers to the latest beta release (180.06) .
For those interested, you can get them here: http://www.nvnews.net/vbulletin/showthread.php?t=123072 While this behaviour was most noticeable Firefox for me, I had encountered it in other X applications as well and suspected a driver issue. KDE 4.1 seems to be running smoothly for me now too. Hopefully this solves it for others as well. I'm running a 64-bit kernel and my video card is a Quadro FX 570M. Matt -- Firefox causes massive Xorg CPU usage https://bugs.launchpad.net/bugs/38131 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs