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yes



Thank you, switching to Nouveau was the right advice.
The desktop feels snappy again and apart from missing vsync and minor display (maybe redraw) issues I did not experience stability...

sure




No. Handling 50% more pixels can not reasonably cause a slowdown of factor 10 or so.



I am already hit by slow 2D desktop performance, not even considering 3D.

Nvidia can, my setup is 2560x1440 landscape plus 1200x1600 portrait on a 8800 GT.
Works fine BUT:

This setup is dog slow (compared to NOT running a monitor in portrait mode or Windows 7). It...