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  1. Minecraft: Java Edition
  2. MC-135289

Water updates extremely slow (server lag)

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    Details

    • Type: Bug
    • Status: Open
    • Resolution: Unresolved
    • Affects Version/s: Minecraft 1.13, Minecraft 18w30b, Minecraft 18w31a, Minecraft 18w32a, Minecraft 18w33a, Minecraft 1.13.1-pre1, Minecraft 1.13.1-pre2
    • Fix Version/s: None
    • Confirmation Status:
      Community Consensus
    • Category:
      Performance

      Description

      The bug

      Server-side water updates seem to be roughly 10x slower than in 1.12.
      The comparison between 1.12 and 1.13 can be seen in this video by gnembon.

      Test to exhibit this behavior:

      1. Create a flat world.
      2. Execute /fill ~-100 ~ ~ ~100 ~ ~ water
      3. Wait for the water to flow completely.
      4. Execute /fill ~-100 ~ ~ ~100 ~ ~ air

      When the water is removed I recorded a peak at 81 mspt on 1.13 and a peak at (roughly) 8 mspt on 1.12.2.

      This makes flushing mob farms unusable: on my survival world, I get peaks > 150 mspt.

      The mspt measurment on 1.12 is a bit tricky as there is no way to measure it properly:
      I used /forge tps from Forge mod loader to measure it.

      Slow down summary

        1.12 1.13 18w33a 1.13.1-pre2
      create water 4 34 20 14
      remove water 8 81 24 18

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              • Assignee:
                Unassigned
                Reporter:
                csdt Florian
              • Votes:
                56 Vote for this issue
                Watchers:
                32 Start watching this issue

                Dates

                • Created:
                  Updated:
                  CHK: