Massive Lag

When I enter the Nether in the newly updated version, it lags big time. The most lag I have ever had. I tried to delete apps and make space. I do other stuff as well and nothing works. Sometimes when I leave the Nether I have to shut down my IPod and turn it on again to be able to play. It never happened to me before without the Nether. I think it's the Nether problem. If you need anything else contact me. Thank you.