Originally Posted by wiresquire
I had a similar sounding problem that I noticed mainly with flash. This may not be your problem, but is an easy thing to check. The problem was the ubuntu ondemand cpu profile is a little, err, too 'lazy'. It doesn't speed up fast enough when you need the cpu power.
I always disable that feature in the bios. I just verified it with 'cat /proc/cpuinfo' to make sure it hadn't gotten flipped back on by accident.
Any other ideas? It's maddening.