I had the stutter but after killing pinball arcade manually and I have no problem.
This seems like a good time to repeat my prior advice about playing TPA on iOS devices (which…come to think of it…I'm not sure if I mentioned it in the first place): I highly recommend turning off "banner" notifications for *every* app in Settings > Notification Center. The banners completely kill the frame rate in TPA, and the momentary loss of control quite often causes the ball to drain. You really don't want that happening. Since I mostly just play on the iPad, I just keep all banners disabled on there. (I do have a few banners allowed on the iPhone, but I usually don't play TPA on my phone.)
Even on the iPad 3, those banners will murder your frame rate.
I've had no issues or lagging on any table with ios6 on an iPad 2. It's a wifi only model, so maybe there is something to the idea that 3G signal hunting etc causes lag.
I have a wifi only model, so that wasn't it.
Luckily ios6 has added ' do not disturb ' which stops the annoying while playing TPA notifications. I never understood why apple removed the global notifications on/off switch in ios4 or 5.
Notification Center didn't even exist until iOS 5.