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  1. Minecraft: Java Edition
  2. MC-228136

Minecraft 1.17 Unplayable Lag when upgrading existing 1.16.5 worlds to 1.17

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    • Icon: Bug Bug
    • Resolution: Invalid
    • None
    • 1.17
    • None
    • OS: Windows 10 Home Single Language(64-bit) version 20H2(build 19042.1052)
      PC Specs:-
      Processor: Intel(R) Core(TM) i3-8100 CPU @ 3.60GHz 3.60 GHz
      RAM: 4 GB
      Storage: 1 TB HDD
      Graphics: Intel(R) UHD Graphics 630
    • Unconfirmed
    • (Unassigned)

      When I upgrade an existing world(saved in 1.16.5 for me) to 1.17, there is unbearable lag, so much so that I can't play the game at all. However, when I create a new world in 1.17, there is absolutely no lag whatsoever, and the game runs buttery smooth. And the world that was upgraded from 1.16.5 to 1.17 was also running buttery smooth in 1.16.5, but in 1.17, it's absolutely unplayable.

            Unassigned Unassigned
            Terminator7382 Great Lord
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              Created:
              Updated:
              Resolved: