I have a similar problem with Gal Civ Ultimate Edition (just updated via Impulse). The game is unplayable due to exessive jerkyness even at lowest settings (which are ugly anyway). My computer isn't exceptionaly powerful but it meets min specs and I was able to play the demo flawlessly with high settings. My graphics card is a GeForce 5500 with the best drivers for it is decided by NVidia scan thing.My processor is a 2.4 Ghz Celeron and I have 1.12GB of DDR RAM. I am running up-to-date Windows XP.

This is a massive disapointment as the ultimate edition was a big expenditure for me as a student. As far as i am concerned, one of the key uses of demos is to determine whether a game works on your computer before you buy it and it is therefore unaceptable for a game to not work when the demo does.

As I said, I tried setting everything as low as it could go including turning antialiasing off (it was the first thing I tried) and yes, I did restart the game before testing. As with the starter of this thread, performance is fine if I don't looks at anything or are zoomed out loads (I missed that out in my first post). Also there is even jerkiness on the ship design editor and race creator screens that include a render of a ship(s). Menus and everything run fine. What I don't get is how I can run games like Torchlight, Audiosurf and Portal no problem but not Gal Civ 2!

Edit: After some experimentation, I disovered that is solely ships that re problematic (deleted starting ships on a new game and it runs fine) - hope this helps. Maybe there was some fancy ship rendering effect added in a expansion pack that my graphics card isn't very good at?

I did that as well. As I said, everything as low as it could go

I presumed that would be pointless as there is no actual error. If you want my specs, i'll send you a .nfo file