Sooo much lag now i have updated to IOS 10

ok so i have updated my ipad 4 about a week or 2 ago, and ever since my neomon game has got so bad with lag. it starts ok but gets worse and worse. My nephews neomon on the ipad mini doesnt have this problem.

to stop the lag i close the app and reopen it, and it doesnt seem to be as bad.  i even removed the app and reinstalled and used my code to get back my game data, but the game is still freezing.

it even freezing on offline mode, for example when training the game will freeze so much it stops working and you have to reopen the game.

ok so i have an ipad 4, with a a6 processor and ios 10.

oh also my hero has got up to just below level 60, so im not sure if this could be the problem?

anyone have any ideas of what i could do? because i really dont want to start again because of my log in bonus.