I have tried all 4 options.
Software gives me a screaming 90fps (talk about a fast paced game. Kinda tough when you have the reflexes of a 3 legged parapalegic cat)
DirectDraw gives me an easy 50+fps
D3D doesn't work on the test, haven't tried it for the game yet.
Glide goes about like DirectDraw does.
I've tried all resolutions as well.
I did read the roof fade in/fade out thread & it does seem he has a similar problem. It does seem like mine is a little more predictable than his, but who knows. At least I do know that I am not alone with the problem & have somewhere else to start from.