Summary:
When scrolling with a touch screen on the world select, the game freezes sporadically.

Steps to reproduce:
On my device scrolling with about 20 worlds is doing this. It may be related to how the worlds are selected even while scrolling.

Expected results:
The selection screen will smoothly scroll.

Actual results:
The selection screen will scroll and sporadically freeze.

Notes:
This was done on an iPad Mini 2, which is pretty much the same thing as the 3 minus the Touch ID, so it is probably not an issue with the processing power. This might be able to temporarily be fixed by making it so you can scroll on the side instead of on top the worlds.