I've had technical problems with this game and how it runs on my PC, which has really put a dent into its production. AvP2 is in serious need of patching for modern hardware (I would love it if there was a steam release for this reason). From what I can gather, a lot of the core mechanics (objects, scripts, animations, etc) are tied to framerate, which is utterly daft. If you're running a monitor with a high refresh rate and displayport, then the game will run faster than it's intended unfortunately.
I tried capping the framerate to 60 using dxtory, but it felt unnaturally jerky. So I ended up hooking up another monitor, which is 60Hz, and it feels a lot smoother on that. so I can at least test my AvP2 maps properly now at the normal game speed.
Anyway...