Originally Posted by netllama
If you use modes smaller than 1920x1200 in Twinview, is the performance any better?
I did a few tests today:
As you say, it could be a hardware limitation. Perhaps it's hitting a maximum texture size limitation such as 2048x2048? It doesn't seem to be caused by number of pixels, because 1920x1200 on a single screen (2.3 megapixels) is smooth as butter, and 1280x800 on two screens (2.0 megapixels) is much jerkier...