Expose choppy, anyone else?

[Air]

Normally expose is okay and smooth, but once I go in with 10+ windows or a high quality image/pdf, the frame rate drops massively and the windows kinda jerk into place with a low frame rate. I have a Dell Latitude D630 with an NVIDIA Quadro NVS 135m graphics card, which is supported natively by NVDANV50HAL, and it's very similar to the NVS 140m which has no expose problems (and 256 mb of video card memory vs my 128). Higher end GPUs seem to have this problem too though, whereas some integrated GPU machines don't, although i don't know if these integrated GPU users have tried large pdf's and such.

 

Anyone have any ideas or can shed light on this? I've also heard disabling beamsync helps, but it hasn't worked for me (or most people). Can it be that my graphics card just isn't able to handle something as simple as expose? I'm hoping it's just bad coding and something Apple can fix with a software update, b/c my GPU is integrated and I can't upgrade it .