Recently in the Nintendo Switch version of Minecraft there has been a very annoying bug. It's basically a very long time until i can actually see the main menu. in my testing it has taken roughly 30 - 45 minutes each time the game is loaded. What usually would happen before the bug is it would spend about 1 - 2 minutes on a black screen and 3 - 4 minutes on the Mojang studios screen. But now its been taking 10 - 12 minutes on a black screen and 20 - 30 minutes on the Mojang studios screen. 

How to re-create

1. Load Minecraft on your Nintendo Switch
2. Wait

I've talked to some of my friend who have the same version I do and it seems it only happens on an older Nintendo Switch. The bug started about a day ago (Oct 26) for no particular reason. It worked just fine days prior. Also to top it off, Joining realms, worlds, servers, opening the marketplace or settings menu take significantly longer. I hope this is resolved soon as I'm certain this is happening to others as well. Have a nice day!