Slow game startup (it takes a while to show anything)

Edited version by kaleb418:
What i know is the game now takes to long to load, or you must do a trick. To do the trick you need to open a world, the screen is black, then close the app and then open it again and it the world will work.

Original Version:

What i now is the game now takes to long or do a trick to start minecraft. How the trick is when starting the game the screen is black and I quit the game and then I enter the game back and the game started.