Simple solution to some of the stuttering

I think that on my System (not "hi-end", with ATI 9000), the reason for low fps is not primarily due to limited processing power, but instead due to limited memory bandwidth (or something like that, I'm not an expert) in the graphics card. I conclude this from the fact that with very little clouds, I can move most sliders to the right and still fly at a high resolution (1400x1050) (at least when I'm not flying above NYC or so ;) ) but with clouds it drops drastically, even when there's little scenery around. Here's what helped - I reduced the resolution! This really sounds like a no-brainer, but I never really tried playing with the resolution because most of the time, it made absolutely no! difference. So maybe some of you guys didn't try that either.So I think what really happens is that at some point, memory bandwidth becomes the bottleneck, and reducing the resolution eases up on it again. And that's why without clouds, you get high frames even with high resolutions.