The game animation become broken and non-fluent. Now what?
A. Some third party utilities, like enhancements, hacks and especially national localizations use to slow down your handheld a lot. We noticed such problem with Cyrhack V for example. The only way to enjoy the fluent animation again is to disable temporary such services before starting a game. You will be able to activate them later again. For more info refer to the program manuals of the utility you use.