I'm not very tech-orientated, but is there somewhere else than the 'video preferences' where you can adjust the graphics settings? I'm having a frame rate of 6.5 frames per sec on lowest settings with no filter, and think that it should be more, just two months old comp and all. Of course, my Windows settings can be to fault, probably even.
Btw, start a game with some AIs playing with nations not allowed to humans in demo. Go to pretender screen (F4), click on some pretender of a restricted nation. Got stuck in that screen for a while until tried the esc key - 'ok' probably isn't supposed to work like that on that screen. Ok, minorminorminor detail, but had to say it.
Anyway, looks great, even with my aforementioned problem.