I've noticed something strange, and I'm wondering if this issue may be my graphics card being taxed harder than normal. I just got an external 22'' Dell 2009WA monitor hooked up to my 2.53 unibody macbook pro. I've also connected an external mouse and keyboard. The mouse is just a regular old dell two button (w/scroll wheel) mouse that I used to use with my old pc. Something I've noticed in firefox no matter how sparse the webpage is or how graphics filled it is that scrolling with my mouse wheel has a slight delay on it. By this I mean I'll turn the wheel three clicks (to scroll through a recently loaded webpage), but the page won't scroll down until about a second or two later. Once I get going on that page, the scroll wheel works just fine w/out the delay. I know the mouse isn't broken as it works fine with my pc. And I've tried fiddling with the mouse/keyboard scrolling preferences in mac os x to no avail. Is my graphics card (9400) being taxed by running an external monitor at 1680, such that my system takes a bit to scroll using my external mouse? Is it possible that there's just too much taxing the graphics card and that's why the mouse scrolling is delayed/jumpy? It seems strange to me as I never noticed this when using my external mouse with the regular 15'' internal macbook pro's screen. Using the external monitor, the first time I try to scroll a webpage causes this slight 1 second delay before it gets going. I don't have the delay at any other times or in other application or the finder.