Minecraft PE glitchy/laggy main menu

For the past two weeks, my minecraft PE's main menu has been very laggy anytime I try to enter. With patience, I am able to get into the realms and works perfectly fine once I'm in the world. But, it is frustrating when the main menu is very laggy even when I'm just entering in. I tried reinstalling minecraft several times and I still have a huge amount of space left in my phone.