I did a clean install of Ubuntu 8.04 on my Athlon64/GeForce 8600GT main box. The performance issues are GONE. It's still not as fast as my Thinkpad T60 laptop but its close. The ONLY thing I did after this was install the NVIDIA drivers to get Compiz-Fusion working and when I rebooted and tested again the issue was BACK.
So it looks like this bug is directly between the Firefox 3.0b5 and the nvidia-glx-new drivers. Since Opera 9.5 beta is just as fast running these drivers its hard to say which is to blame. But one way or another that pinpoints the problem.
Narrowing it down:
I did a clean install of Ubuntu 8.04 on my Athlon64/GeForce 8600GT main box. The performance issues are GONE. It's still not as fast as my Thinkpad T60 laptop but its close. The ONLY thing I did after this was install the NVIDIA drivers to get Compiz-Fusion working and when I rebooted and tested again the issue was BACK.
So it looks like this bug is directly between the Firefox 3.0b5 and the nvidia-glx-new drivers. Since Opera 9.5 beta is just as fast running these drivers its hard to say which is to blame. But one way or another that pinpoints the problem.
Driver: nvidia-glx-new 2.6.24. 12-16.34
Version: 169.12+
So for now no Compiz-fusion for me : ( I'll just have to wait to either a new NVIDIA driver or a new version of Firefox fixes it.