A 330m is quite a bit below the minimum specs. Some suggestions for making it more playable (though whether this will make it playable enough, I'm not sure):
Reduce the screen resolution. This tends to have the largest impact on performance, so lowering it should help the game run better.
Try the stutter fix in
this thread. Not sure if it'll do that much good, but I've found that it tends to help smooth things out a bit with lower frame rates for whatever reason.
There should be a config tweaker out there that may give you some more control with the settings. I don't have a link because I haven't used it myself, but if you can find it, it may let you lower the settings a little more. Not sure on that one, though. The graphic options typically make less of a difference on the frame rate than the screen resolution, so I wouldn't expect miracles.
Hopefully one of those helps.