Video Accelleration OK, but Firefox performance quite poor!

[razor7]

After following this excellent support thread http://ubuntuforums.org/showthread.php?t=1980663 I got my ATi card working ok, but now I'm facing great performance issues in Firefox (12.0) in plain html pages (like this one), nothing about flash or animations or videos.

When scrolling the page up and down the scrolling gets pretty slow! Also this issue appears when browsing HTML5 pages like games, it get's really slow!

Thanks in advise!

[QIII]

Try starting Firefox in safe mode to rule out problems with add ons.

firefox -safe-mode

[razor7]

Nope, ran

firefox -safe-mode

But no luck

On pages like this http://9to5mac.com/, scroll sucks. Very poor performance!

[razor7]

I ran it again on console and got this

Failed to open VDPAU backend libvdpau_nvidia.so: no se puede abrir el archivo del objeto compartido: No existe el archivo o el directorio
Failed to open VDPAU backend libvdpau_nvidia.so: no se puede abrir el archivo del objeto compartido: No existe el archivo o el directorio
Failed to open VDPAU backend libvdpau_nvidia.so: no se puede abrir el archivo del objeto compartido: No existe el archivo o el directorio
Failed to open VDPAU backend libvdpau_nvidia.so: no se puede abrir el archivo del objeto compartido: No existe el archivo o el directorio
Failed to open VDPAU backend libvdpau_nvidia.so: no se puede abrir el archivo del objeto compartido: No existe el archivo o el directorio
Failed to open VDPAU backend libvdpau_nvidia.so: no se puede abrir el archivo del objeto compartido: No existe el archivo o el directorio
NOTE: child process received `Goodbye', closing down

It says that failed to open VDPAU backend libvdpau_nvidia.so, and can not find that file.

[QIII]

VDPAU is an NVIDIA technology.

Do you have an NVIDIA driver installed?

We just got your ATI card going yesterday!

[razor7]

Hi, no Nvidia at all...really don't know why is that error displayed

[QIII]

Well....

I'll have to think on that a bit.

[QIII]

Well....

I'll have to think about this a bit.

[razor7]

Good, will waith for any hint.

[brainwash]

Failed to open VDPAU backend libvdpau_nvidia.so: cannot open shared object file: No such file or directory

Hardware acceleration for Flash videos is enabled by default, but it is only supported by NVIDIA cards. So this error message will appear, if the library for NVIDIA's VDPAU backend is installed on your AMD/ATI based system. So either delete the library or ignore the messages.

I'm not sure what might cause the slow performance (even on sites without flash content). Try to monitor the running processes while browsing some websites.