When joining a LAN game from specific Nintendo Switches, the game becomes extremely laggy for all players and can make the game nearly unplayable. The most peculiar thing about this "bug" is that it only seems to apply to specific Switches, as implied earlier. After some testing, I can fairly surely conclude that it does not have to do with the Internet/LAN connection, as other Switches on the same Internet/LAN connection didn't suffer from this problem There seems to be no consistent way to recreate this bug, so you'll just have to take my word.

Steps to Reproduce (to my best understanding):
1. Get 3 or more Nintendo Switches, each with its own copy of Minecraft on the same Internet connection.
2. Switch all from Online to Local Network, and use a host console to connect the others to one world.
3. Connect one Switch at a time (and change the order of connection if necessary) until a noticeable increase in lag spikes/frequency occurs.

Expected result:
All Nintendo Switches should be able to connect fairly easily to the host console and should all perform smoothly, excluding any lag caused by other factors.

Observed result:
Some Switches seem to cause more performance issues than others, making the game nearly unplayable.

Once again, this is a really strange bug, as my testing has suggested that most will not have found this "bug." If I have time, I will try to record examples of the lag/freezing that occurs once the "bad Switch" joins the world.