Since updating to 1.16.100, the game takes over ten minutes to launch. I used the stopwatch app on my phone to time how long it took to go from the Switch launcher to select "Play" on the main menu. All times are MM:SS and rounded to the nearest second.

1. 2:29 - from switch home screen to red mojang logo screen
2. 6:12 - from red mojang logo screen to main menu screen
3. 1:41 - from main menu screen to finish visually loading, including my avatar (which normally is the last item to load). the fancy backgrounds on the "Marketplace" button never load

I also noticed dimensions (nether, overworld) and chunks take much longer to load in the game. The lag is noticeably higher when moving around and running farms.