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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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    • Icon: Bug Bug
    • Resolution: Duplicate
    • None
    • 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
    • * 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
    • Community Consensus
    • Performance

      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.

        1. redstone_clock_enabled.png
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        2. redstone_clock_disabled.png
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        3. redstone_lamp.gif
          redstone_lamp.gif
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        4. 1 - Inactive - Close.png
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        5. 2 - Active - Close.png
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        6. 3 - Active - Near.png
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        7. 4 - Active - Far.png
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        8. 6 - Active - OK.png
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        9. 5 - Active - Better.png
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        10. Forest - Laggy.png
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        11. Mountains - No Lag.png
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        12. Roofed Forest - Fast Graphics - Less Lag.png
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        13. Roofed Forest - Fancy Graphics - Massive Lag.png
          Roofed Forest - Fancy Graphics - Massive Lag.png
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        14. Air - No Lag.png
          Air - No Lag.png
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        15. Proof-lighting updates.mp4
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        16. Roofed Forest - 15x15.png
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        17. Roofed Forest - Off.png
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        19. Roofed Forest - 1.12.2.png
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        20. Beach - Furnace Lag.png
          Beach - Furnace Lag.png
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        21. Roofed Forest - Furnace Lag.png
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        22. Saturated Lighting - No.png
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        23. Saturated Lighting - Yes.png
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        24. redstone_lamp_13pre6.gif
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        25. 18w44a.png
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        29. 2019-03-31_02.39.29.png
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            Unassigned Unassigned
            tfellows Tim Fellows
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              Created:
              Updated:
              Resolved:
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