Bad Update

This game was one of my favorite games for the past couple of years, until the recent update. Now, my games very glitchy and lagging. I dont know why, because thats the kind of things that updates are supposed to fix. Also, there are too many extra options you can pick when you create a world. I liked how you would just choose creative or survival, and then infinite, old, or flat land. Now its too confusing. ??

Rachel L.?? about Minecraft: Pocket Edition, v1.1.3