Lag + Game Crash

Ever since the new update was announced available, my game keeps crashing and constantly lagging. I get it, my ipad might be a bit outdated (ipad mini 2), but it’d be nice to still be able to play minecraft. 

Everytime I place/break a block, it still thinks it is there but isn’t shown on the screen. And everytime I leave the game, to save, my game crashes.