Fedora Core 4 CPU usage high with VLC

[Muralidhar Ganga]

Hi,

Running Fedora Core 4 on Celeron 2.53 GHz PC, with no updates.
Installed VLC from livna repository.

Using NVIDIA GeForce Fx5500, 256 MB AGP graphics card.
Updated the driver from livna repository.

The CPU usage is at 50-60 %, when tried to play video clip (.mpg) of 
20m (constant bit rate)

Surprisingly, when I installed Redhat Enterprise Linux 4 on the 
same hardware, the CPU usage is only 3 %.

Any ideas ?

Thanks
/Murali