I've not noticed any increase on screensize for 1024x768 or 800x600. True it's a lot better graphically but other than that no difference. The larger the res the slower too.

I once tried (offline) 4v4, manually chose all armies with 120 units and at 1280x1024x32 resolution (max settings I could have.) I'm not sure exactly but I think the game lasted 5 hours plus ....

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The Soul

"What people do to their souls
They take their lives - destroy their goals
Their basic pride and dignity
Is stripped and torn and shown to pity"