the 1.3 mazefinger update causes stuttering

I downloaded the 1.3 update for Mazefinger today and I immediately noticed the game started stuttering a lot, something that never happened before. I tried restarting and it didn't get any better, uninstalling and reinstalling did nothing either. It's specially bad when I first start dragging my finger - it freezes for about half a second and after that it's very laggy and not nearly as smooth as it used to be. I'm using a 1G iPod touch.

Thanks in advance for you help!