Minecraft: Java Edition Forum  /  3 Awaiting Worlds mod

I've seen speedrunners that have 3 worlds in the corner already loaded, so when they're finished with a run they go to the next one with the press of a button, I assume it's a mod but what mod is it?

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It’s not a mod, it’s using multiple instances, join Javacord or specnr’s discord to get more info on it.

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