The nether reacter is lagging it started after the update bug!! Lag real bad when you go to the nether reacter core

It lags real bad when you go to the nether reacter core I have iPod touch 5g 32 gb I have a lot of memory it lags alot in nether reacter please fix it never did it before go to the nether reacter to trigger the bug it will lag real bad and freeze up