Update: I have tested this with the official launcher and it's still affected but nowhere near as bad
When you have loaded chunks and the bamboo within the chunks updates it creates a lot of lag like the frame rate drops as low as 2FPS.
How to recreate: Create a Single Biome world set to bamboo jungle and load the world, load some chunks and wait
:The chunk render distance should be 32 chunks or less
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This could be caused by bamboo updated when over water pools which cause lag: MC-123584 does this describe your issue?
Could you please try killing all item entities using the following command:
/kill @e[type=item]And then comment the number of killed entities shown in chat. Please also let us know if this had any effect.
Invalid MultiMC in use.