ATI problems

ok ever since i got my new graphics card (ATI radeon x1300 256mb) wheneber i try to use the UV/Image editor it is really slow and i have trouble moving around my uv map this also happens when i try to use a background image to help me with my modeling and it is realy annoying. So i was wondering why this happens now because it never happened with my older card wich was a very bad card an intel extreme built in card with like 32mb of video ram