When creating a creative infinite world keeps on crashing

When I go and create a new world that's infinite and launched it this what happens.First, thinning that I notice is that it takes awhile when loading up a world.Second, thing when it's finally loads up the world it lagg's like crazy.For example, when it's finally loads up and I try to move far wads it works find but if I try to swipe to the right,left, up or down awhile moving it keep on crashing.For example, awhile moving award and I swipe my screen awhile moving it first freeze then the game crash.Also when I in a infinite word/flat world and I press the inventory button it freeze's first then it crash's.The crash's are for creative and survival.