Quote Originally Posted by Tuttle
AFAIK Firefox is mostly (completely?) single-threaded, so it can only use one core. If you had a quad-core processor, you'd only see 25% use.

If you look at the Performance tab in Task Manager, you should see one CPU core flat out and the other one close to idle.
No, I watched taskman and no both cores are being utilized about 50 percent each.

I had a core2duo machine and it seemed to work a lot better.

I still have the machine but I need to replace the motherboard in it because the hd controllers have problems.

This is kinda of a spare machine I have, I thought perhaps there is some fix for amd chips that would help it utilize the cores better.