Jitters or slightly jumpy animation is simply because the pc is not a dedicated game machine. (PC tasks like virus checkers, internet connections, etc, steal valuable resources from your apps.) Ironically, on a PC the faster the frame rate the more you will notice the jitters when/if they occur. If you lock your game at a slower frame rate, say 30fps, you pretty much have compensated for the occasional jitter automatically and wouldn't even need jitter correction. I have a test machine not connected to the internet, no memory resident programs, no virus checkers, etc. That machine runs pc games smooth as butter, but even on that pc there's still occasional jitter.