CPU overload

[Kartel]

Hello,
I'm using VideoLab .NET components in my C++/CLI project to recieve videostream from IP camera, save it to file adn show it in ImageDisplay component. I try to connect 4 cameras at once but I got 100% CPU loading while trying to save to file with compression. After checking mediainfo of file without compression I found out that I recieve stream with 500Mbit/s bit rate while camera gives 4Mbit bit rate stream. Guess that bit rate is cause of Bits/(Pixel*Frame) value that is 24.000 by default. Could I change this value somehow to recieve normal bit rate stream from camera? Or are there any other solutions of my problem?
I have Intel Core i5 750 2.67 GHz CPU

Thanks in advance.