Very low fps on a notebook

Hi!

I was playing Crossfire for about a year ago on my computer. A few weeks ago I've got a notebook and installed the game on it.
But it's unplayable slow, it only has about 5-10 fps. But my notebook is much stronger, than my home PC was. It's specifications:
Intel Core2Duo 2.0 GHz
2*2 GB 800MHz RAM
ATI Mobility Radeon HD 4570 with 512 MB VRAM
Windows 7 Professional with all the updates.

Please help me solve the problem because I really want to play the game.

Another question: can I use custom resolution in-game? I mean my screen is 1366*768, but it's not supported...

Thanks for your answers,
Szathy from Hungary

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