4.70 is what I have and it freezes like crazy. It seems most of the people in the thread who says it's running fine are using 4.73. So that is what I am going to try.
I would guess erasing it would wipe your current games, but maybe someone else can verify. One of many pains of having to sideload. You can't run a normal app update.
I have version 4.73 and it constantly crashes, normally every other time I make a move. And it ALWAYS crashes if I chat with the player and/or get a wild blank tile and attempt to use it.
I always have about five games going on at once (yes, I'm addicted) and it gets old - but at least I don't have to buy an iPad to play it.
I would pay money to get a non-crashing version from App World. Are you listening Zynga?????