If you use firefox, you may have noticed sometimes it stays eating cpu, even if your not using it on focus. The reason for this is flash. If you install
FLashBlock it will make firefox not only faster , but your computer also. For aggges i have been racking my brain trying to find what was using cpu, It doesnt matter if you have 4545 cpu's, no one wants something running when your not even using it. all along it was flash. With flashblock. it works like adblockm, another FF extension i would reacomend.