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  1. Minecraft: Java Edition
  2. MC-13443

framerate drops to <20, but resolves if <esc> and reenter game



    • Type: Bug
    • Status: Resolved
    • Resolution: Incomplete
    • Affects Version/s: Minecraft 1.5.1
    • Fix Version/s: None
    • Labels:
    • Environment:
      Win 7 64-bit, 3ghz 8-core bulldozer, 32gb ram, nvidia gtx560ti, java 17 64-bit, render distance max, etc.
    • Confirmation Status:
    • Game Mode:


      I have a certain place in my world where I can
      literally walk across the floor in one level of my mine
      and the frame rate will drop to next to nothing (under
      20 fps), where the framerate is normally ~250-300+ fps.

      I noticed this started happening around the same time as
      the 1.5.1 release and/or Java 17 came out.

      Something I noticed while trying to get enough info to
      post a "reasonable" bug report...

      I had Windows Task Manager, Performance tab (showing
      CPU utilization graphs) running on my 2nd monitor while
      playing MC on primary monitor...

      While framerate running "normal" in the 250+ range, I
      see 4 cores with consistant utilization > 20%, 3 of
      them in the 15-30% range and one core in the 80%+ range.

      When I walk across that boundary and the framerate goes
      in the tank, a large amount of the compute load shifts
      from the one higher utilized core to one of the lower
      utilized cores and stays there until the "event"
      (whatever it is) eventually gets resolved (takes >30
      seconds, up to a few minutes to resolve itself).

      HOWEVER, should I hit ESC to get to the "return to game/
      save & exit" screen, the framerate resolves almost
      immediately (within a couple of F3 screen updates).

      What I expected to happen was...:
      answered above

      What actually happened was...:
      answered above

      Steps to Reproduce:
      I have not been able to reproduce this bug EXCEPT in
      this one particular world... and in this one particular
      spot on the map... but, I'm still looking at it when the
      mood strikes me...




            Unassigned Unassigned
            s_taylor s taylor
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