Comment 112 for bug 217580

k, same Firefox Version here (3.0.11+build2+nobinonly-0ubuntu0.9.04.1).

I'm running Ubuntu Jaunty 9.04.1 64 Bit with all updates.
Mhm, maybe it's the video driver. I recently (yesterday) updated my nvidia driver to version 180.60 (from 180.44) so I can use it with the new 2.6.30 kernel. If you have an nvidia card, you should try it. Packages for Jaunty are available:

wget http://archive.ubuntu.com/ubuntu/pool/restricted/n/nvidia-graphics-drivers-180/nvidia-180-kernel-source_180.60-0ubuntu1_amd64.deb
wget http://archive.ubuntu.com/ubuntu/pool/restricted/n/nvidia-graphics-drivers-180/nvidia-180-libvdpau-dev_180.60-0ubuntu1_amd64.deb
wget http://archive.ubuntu.com/ubuntu/pool/restricted/n/nvidia-graphics-drivers-180/nvidia-180-libvdpau_180.60-0ubuntu1_amd64.deb
wget http://archive.ubuntu.com/ubuntu/pool/restricted/n/nvidia-graphics-drivers-180/nvidia-glx-180-dev_180.60-0ubuntu1_amd64.deb
wget http://archive.ubuntu.com/ubuntu/pool/restricted/n/nvidia-graphics-drivers-180/nvidia-glx-180_180.60-0ubuntu1_amd64.deb

I hope it works, because else I have no clue why it works so smooth now.

gmail is running fast, aatdark's testsite is running smooth, overall every pages runs smooth like opera does :-)