ToME: the Tales of Maj'Eyal

Hey, A friend of mine really wants to play ToME. Unfortunately the tiles don't seem to play well with his computer (Which is strange, his old one had a fraction of the power, maybe it's a driver issue? I'm not sure.) Anyway he can't get into the game to change the options to tiles and hasn't found a...

This has only begun recently, I play windowed and often alt-tab to chat on IRC (A lot of the time about ToME, only been playing a few days, splatted a few characters around level 10ish, really enjoying myself) Today, everytime I alt-tab and go back to the game, it takes about 5 minutes to respond to...