Slow to go or leave the nether / game freezing when leaving the nether.

Sometimes it takes a long time to move from the normal world to the nether.
Sometimes the game freezes when trying to go from nether to the normal world.

Note: This happened to my survival world created in version 1.0, I have been playing for a long time in it and the nether had already been spawned on it for a long time.
This bug appeared in version 1.1
Samsung galaxy j3