When I try to open any menu, Minecraft first moves all the stuff it needs to move to open the menu. Then it sits for a second or two, and it thinks. And thinks. And never does anything. It does this with chests, chat, pause menu, inventory, crafting stations and furnaces. While it’s think I can walk around, look around, crouch, change my camera view, and that’s it. I can still get hurt, so when this happens on survival, I’m 100% guaranteed to die if I’m not hiding in a hole. When I walk away from the chest or crafting station It’ll finally show me the inventory slot for .00001 seconds, then close out. 
This doesn’t happen all the time, but when it does, it’s super frustrating.

It might just be that the switch can’t handle crowded realms or worlds that have gigantic buildings in them.