The game is extremely laggy when I try to play multiplayer, to the point where the game just crashes and you have to re-open the game just to join the world again, You can't mine blocks and everything in the game is frozen. This only started happening when 1.20 came out and changing settings or making a new world didn't help it.
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GoldenHelmet
migrated
The multiplayer connection was just joining another players world, The devices are a windows 10 PC, and a Nintendo Switch Oled which worked fine on multiplayer before.
GoldenHelmet
I am resolving this as a duplicate of MCPE-171186. We will track the issue with multiplayer lag on consoles on that report.
What kind of multiplayer connection are you trying to make--Realm, server, LAN, split-screen, or connention via Microsoft Account? What device are you using?