Comment 10 for bug 144216

I'm experiencing this on a Vostro 1500 (basically an Inspiron 1520) with the following specs:

Core 2 Duo 7300 2GHz
2GB RAM
Geforce 8600 GT 256MB
Ubuntu Gutsy 7.10 x86

CPU usage spikes up when switching tabs/opening windows in firefox, which translates into a slowdown (and sometimes, music hiccups). I've found I can stop the problem by disabling the compiz window decorations and then re-starting the X server, which has led me to believe it's a compiz issue. Enabling note that re-enabling the decorations resumes the problem. I'm not done testing the other plugins, but none of the others so far appear to cause the slowdown.