Yeah, this is a REALLY bad issue. Joining a multiplayer game-especially one with more than 2 players-can lead to SUCH BAD LAG. For example, say it's a Sunday morning. Your brothers are playing Minecraft on the couch; One on Nintendo switch, and one on a tablet. You have your tablet nearby, so you join them. You start to play, but the world starts acting up. Full on lagging back to an area you were in 3 minutes ago, killing animals when no one touched them or used commands, teleporting is just wrong, and if someone tries to swim, everyone teleports to a far off place, it's insane. Mojang, Please fix multi-player!!
EVEN THE VIDEO IS LAGGY!!!