CPU Usage Windows

[Rad]

Hi,

I've noticed that when I run Python script on 
Windows 2k Pro
Dual Intel Xeon (2.2GHz)
CPU Usage for pythonw.exe is only 50%?!

Nothing else is running on the machine (apart form the OS). Some of
the python programs are running for hours (large data sets) and even
though python shell freeze's (doesn't refresh) CPU usage is still only
50%.

System Idle Process is about 40%-50%

Any ideas why is this and can I do anything about it?

Is it something to do with python not being able to use the power of
both processors?

thanks,