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.