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  1. Minecraft: Java Edition
  2. MC-126518

Redstone or lighting updates causing severe lag and framerate drops

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    Details

    • Type: Bug
    • Status: Open
    • Resolution: Unresolved
    • Affects Version/s: Minecraft 18w09a, Minecraft 18w10a, Minecraft 18w11a, Minecraft 18w14a, Minecraft 18w14b, Minecraft 18w15a, Minecraft 18w22b, Minecraft 1.13-pre2, Minecraft 1.13-pre3, Minecraft 1.13-pre4, Minecraft 1.13-pre5, Minecraft 1.13-pre6, Minecraft 1.13-pre7, Minecraft 1.13-pre8, Minecraft 1.13-pre9, Minecraft 1.13-pre10, Minecraft 1.13, Minecraft 18w30b, Minecraft 1.13.1-pre2, Minecraft 1.13.1, Minecraft 1.13.2, Minecraft 18w46a, Minecraft 1.14.3
    • Fix Version/s: None
    • Environment:
      • Windows 7 Ultimate 64-bit
      • Intel Core i7-950
      • 16GB RAM
      • AMD Radeon HD 6800
      • Java 1.8.0_161 64-bit
      • Also tested the bundled Java 1.8.0_25 64-bit
    • Confirmation Status:
      Community Consensus
    • Category:
      Performance

      Description

      Even basic redstone contraptions are causing severe lag and framerate drops. I typically get well over 100 FPS (redstone_clock_disabled.png). To duplicate, I created a simple redstone clock that toggles a number of redstone torches and dust. While active (redstone_clock_enabled.png), this causes my framerate to drop to about 25 FPS (using the bundled javaw.exe 1.8.0_25 my framerate drops to 5 FPS).

      I think this may be a lighting issue, however. I tested a redstone contraption that does not create lighting updates with a piston and rapidly flipping the lever causes no lag. If I add a redstone lamp, the lag spikes return (redstone_lamp.gif). Ninja Edit: I also get a lag spike when placing and item in a furnace and it fires up.

      This may be related to the issue reported here: MC-124086 which I believe has been erroneously marked DUPLICATE, as this bug is not present in Minecraft version 1.12.0.

        Attachments

        1. Saturated Lighting - Yes.png
          Saturated Lighting - Yes.png
          787 kB
        2. Saturated Lighting - No.png
          Saturated Lighting - No.png
          763 kB
        3. Roofed Forest - Off.png
          Roofed Forest - Off.png
          713 kB
        4. Roofed Forest - Furnace Lag.png
          Roofed Forest - Furnace Lag.png
          841 kB
        5. Roofed Forest - Fast Graphics - Less Lag.png
          Roofed Forest - Fast Graphics - Less Lag.png
          751 kB
        6. Roofed Forest - Fancy Graphics - Massive Lag.png
          Roofed Forest - Fancy Graphics - Massive Lag.png
          799 kB
        7. Roofed Forest - 5x5.png
          Roofed Forest - 5x5.png
          714 kB
        8. Roofed Forest - 15x15.png
          Roofed Forest - 15x15.png
          717 kB
        9. Roofed Forest - 1.12.2.png
          Roofed Forest - 1.12.2.png
          467 kB
        10. redstone_lamp.gif
          redstone_lamp.gif
          8.06 MB
        11. redstone_lamp_13pre6.gif
          redstone_lamp_13pre6.gif
          8.88 MB
        12. redstone_clock_enabled.png
          redstone_clock_enabled.png
          505 kB
        13. redstone_clock_disabled.png
          redstone_clock_disabled.png
          479 kB
        14. Proof-lighting updates.mp4
          6.34 MB
        15. Mountains - No Lag.png
          Mountains - No Lag.png
          666 kB
        16. Forest - Laggy.png
          Forest - Laggy.png
          960 kB
        17. Beach - Furnace Lag.png
          Beach - Furnace Lag.png
          1.50 MB
        18. Air - No Lag.png
          Air - No Lag.png
          2.70 MB
        19. 6 - Active - OK.png
          6 - Active - OK.png
          1.95 MB
        20. 5 - Active - Better.png
          5 - Active - Better.png
          1.95 MB
        21. 4 - Active - Far.png
          4 - Active - Far.png
          1.94 MB
        22. 3 - Active - Near.png
          3 - Active - Near.png
          1.04 MB
        23. 2 - Active - Close.png
          2 - Active - Close.png
          948 kB
        24. 2019-03-31_02.39.29.png
          2019-03-31_02.39.29.png
          1.11 MB
        25. 2019-03-31_02.21.54.png
          2019-03-31_02.21.54.png
          1.06 MB
        26. 2019-03-31_02.21.37.png
          2019-03-31_02.21.37.png
          1.09 MB
        27. 2019-03-31_02.21.28.png
          2019-03-31_02.21.28.png
          1.02 MB
        28. 1 - Inactive - Close.png
          1 - Inactive - Close.png
          1016 kB
        29. 18w44a.png
          18w44a.png
          1.01 MB

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              • Assignee:
                Unassigned
                Reporter:
                tfellows Tim Fellows
              • Votes:
                90 Vote for this issue
                Watchers:
                42 Start watching this issue

                Dates

                • Created:
                  Updated:
                  CHK: