1280*800, on DDA I'm typically running 50*24. Also I'm not sure it affect performance that much, as everything around you is computed even if not displayed.
It does impact performance for things that do not need to be computed if not displayed. -- With 16x16 pixels tile size not even 12x12 terrain size can fit properly on that resolution. I don't understand why would you want bigger terrain window when even the smallest one barely fits. Are you not playing with tiles? What font size do you use?
P.S. Can you change the forum settings so I don't have to await 2 minutes between each posts? It's quite annoying.
Ok.