Spitfreak, it sounds as though your video settings are set higher than your computer is capable of running with in game.
Go into your video settings when you first launch the game (before you log in even, select video settings from the very first window that opens when you launch the game), and set your max texture size to 512 and set your screen resolution to 1024X768.
If you are unable to get to this first window due to really slow mouse reaction do this:
Go into the HTC aces high folder and open it. Find the settings folder in there and open it, then delete the video8cfg file there. This will cause the game to prompt you to set your video settings the next time you launch it.
Your mouse is slow because your settings have been set to high for some reason.
Hope this helps.
cheers,
RTR