I'm using an NVIDIA Quadro PCI-E DVI video card with a P4 3.4 GHz HT processor. Actually, I'm now using both orientations (primary 4:3 and secondary 3:4) and I'm certain there is a performance penalty. There is no reasonable explanation for this phenomena that I can think of except a poor hack of an implementation...
Are you sure you haven't noticed any difference? Are you running at 1600x1200 resolution?
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