Frame rate problem

Hi,

I'm actually using OpenCv on a Xp pro / AMD 3200+ plateform, with a 
30fps-usb-logitech webcam.

I use CvCam callback system to capture the frames but the I never get 
more than 9 fps, and sometimes even only 6fps (I only count captured 
frames and return form the callback).

So my question is: 

Are usb cams so poor, and 9fps a normal frame rate for my config, or 
do I have to fix any software-thing to increase my framerate?

Could I get better results using a 30$ USB/PCI card?

(Motherborad: Asus's A8NE (nvidia nforce4 chipset)) 

Thanks :)






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