Minecraft starts lagging after a while

  • Andrei Buruntia

    I have a decent PC, with an intel i3 CPU, 3 GBs of RAM and a 1 GB GDDR3 128-bits graphics card.

    I can run MC just fine, getting over 60 fps most of the time. I noticed that when the memory usage of MC gets close to 1 GB, it started to freeze for 2 seconds then coming back and repeating the cycle. Only solution I seemed to find was restarting the game itself.

    My guess is that after going through all those landscape elements, the used memory starts to build up and the game chokes (does that make any sense?).

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    Minecraft FPS irregular in fullscreen, but reporting 35-45
  • l0b0

    How to reproduce:

    1. Start the PC, and log in to Linux Mint 12 (although I'm pretty sure the same issue appeared on Ubuntu 11.10 as well)
    2. Start Minecraft
    3. Maximise the window
    4. Have smooth experience at 35-45 FPS
    5. Quit Minecraft
    6. Start Minecraft again
    7. Maximise the window

    At this point I'd expect Minecraft to behave in the same way as before, but there's an important difference: Most of the time (but not all of the time) when starting Minecraft the second and subsequent times after logging in, even the title screen will be choppy, looking like a movie player dropping frames all the time. The tilted text on the main screen doesn't bounce smoothly, the background doesn't pan smoothly, and the game doesn't play smoothly. The last bit is the most puzzling: It still reports 35-45 FPS, but it's clearly not displaying at that rate. Also, it still seems as smooth as before if I restore the original window size.

    This "lag" doesn't happen every time I start Minecraft, so sometimes it's enough to just restart it a couple times, maximise, and see if the title screen is animating smoothly.

    The fact that Minecraft reports 35-45 FPS, I've got the latest ATI drivers (and saw this issue on earlier versions as well), and that I've had some complete hangs when maximising a lagging Minecraft window (only AltGr-SysRq-REISUB worked, not even Ctrl-Alt-F1), leads me to believe that the window manager, X or graphics driver is to blame.

    Anyone having the same issue or tried-and-tested fixes?


    • ATI Technologies Inc Cayman PRO [AMD Radeon 6900 Series] with BIOS from 2010-11-24
    • 6 GB RAM
    • Intel Corporation Xeon 5500/Core i7


    • Minecraft 1.0 through Snapshot 12w08a
    • Catalyst 11.12
    • GNOME Shell 3.2.1
    • Linux Mint 12 x86_64 with all the updates

    On the same machine, when booted into Windows 7, I get over 100 FPS, and a completely smooth experience.

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