I think that slideshow mode was sarcasm. It means a few frames a second. If you are playing on hardware that won't give a decent framerate with the game, then it won't. You can always try running at a lower resolution, with lower detail / antialising settings, but if it's hardware limited then you are not going to do any better.
It would help us if you posted what hardware you do have, so we could get an idea if it's adequate or hopeless.
Also, please only post the question once. Three versions of it just make more work for the moderation team to delete them.