Hi, i have problem with FPS in this game, just 5 FPS in menu and in game, i ask for my friend instal this game, but he have ~5 FPS too, Win10 64, 4 core processor, GTX750, i dont find in internet that problem, u are my last hope :(

i checked the store page and windows 10 is not even on the list of supported operating systems. only solution i can think of is to try various compatibility modes.

Hey, not sure if this helps given how old this post is, but I bought the game today and did have lag issues too.
My solution was to go into NVIDIA control Panel and make it so that Vsync was on when the game is started.
Manage 3D settings/Program settings/Blitzkreig II is the settings for Alien Nations. I also ran it in windows XP compatibility.