When I first started 1.991, I was getting frame rates of 30.
As soon as I changed the MaxTextureSize from 'unlimited' to '128', they dropped to 24. I changed it back to 'unlimited' and clicked apply, but the frame rates didn't go back up until the last couple of tests (then they stuck around 29).
Windows ME
1GHZ CPU
192MB RAM
64MB Geforce 4 mx 440