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Where Do I Set Java Args for Minecraft

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  1. Tenelia

    Tenelia Master Poster

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    Introduction
    The purpose of this thread is to help players with less capable graphic cards in their computers get better performance in Minecraft. This is mainly achieved by entering a long chain of JVM arguments in your launcher's "Edit Profile". Please keep in mind that I am not a Java expert. I have merely done my own research into Java, so I am only sharing what I have discovered. If anything goes wrong, just delete the chain of JVM arguments that you have used.

    How to Use

    1. Before you use the JVM arguments, you must increase all your video settings to the maximum.
    2. Please also note that you must be running the latest version of Optifine .
    3. Once the above is done, ensure that you are running on the latest version of Java 8 .
    4. Start the game first and note down your current FPS when you hit F3.
    5. If you have more 3GB of RAM to spare, copy and paste the below code into the JVM Arguments:
    6. If you only have 1GB of RAM to spare, use this:

    Important Things to Note
    1. "-Xmx3G -Xms3G -Xmn768m" tells Minecraft to use 3GB of RAM. If you have less than 4GB of RAM, DO NOT use this. Always ensure that your system has at least 2GB of RAM leftover. Never ever use ALL the RAM or your computer will crash.
    2. "-XX:ReservedCodeCacheSize=2048m" tells Minecraft to reserve 2GB of RAM for storing code that might be used again. If you allocated 2GB of RAM to Minecraft, you need to reduce the number here to half of that, which is 1024m for example.
    3. "-XX:SoftRefLRUPolicyMSPerMB=10000" keeps the soft reference to 10 seconds per MB. If it lags your computer, feel free to reduce the number of remove the line entirely.

    Conclusion
    No matter what results you get from using my JVM Arguments, you must share your experience here! I was running at 48 FPS before this and now I am running at 100FPS! :D

    Known Issues

    1. Connected Textures in your video options must be turned off .
    2. Don't assign too much RAM. Always leave 2GB for your computer.
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  2. Teammate

    Teammate Adept Poster - A1

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    XX:parallelGCThreads=10 <-- Got problem
    This looks similar to start option for steam games.
  3. ChiefG

    ChiefG le MEDIC!! Donor

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    u got big RAM though, mein only got 3.5GB
    dat typo
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  4. Teammate

    Teammate Adept Poster - A1

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    That's why he tells you to reduce the amount to half which is 1GB (1024MB)
  5. durianhead

    durianhead Forum Regular

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    That is when u type : and P without the spacing, you get :P XD XD
  6. juggernauts

    juggernauts マゾー先輩 Donor Forum Regular

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    I have 8 gb of ram
    *allocates 4gb of ram*
  7. chase004

    chase004 Initiate Poster - B1

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    Now I Cant play Minecraft :3
    It says " Error:Could not create the Java Virtual Machine "
  8. ChiefG

    ChiefG le MEDIC!! Donor

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    happens to me too
    but now can
  9. chase004

    chase004 Initiate Poster - B1

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  10. Tenelia

    Tenelia Master Poster

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    Guys remember to post your changes. If you experience any performance increases or not.
  11. chase004

    chase004 Initiate Poster - B1

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    When i Install Java 8 and uninstall other java i cant play minecraft only launcher can.
  12. ChiefG

    ChiefG le MEDIC!! Donor

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  13. Tenelia

    Tenelia Master Poster

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    Ya, restart computer please.
  14. chase004

    chase004 Initiate Poster - B1

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  15. chase004

    chase004 Initiate Poster - B1

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    LOLOLOL ! i have 32 bit operating system then i installed x86 LOLOLOL thats the prob !
  16. YuSiangChong

    YuSiangChong Somebody That You Used To Know :D Donor Forum Regular

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    how do u know how much RAM do u have? cos im not sure bout mine.......
  17. Tenelia

    Tenelia Master Poster

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    x64 means 64bit system. x86 is correct btw. If you're using x86, means your 32bit OS will never use more than 4GB of RAM. No matter what you do.
    Check control panel. It's somewhere.
  18. Techbro

    Techbro Sturmtiger Staff Member Helper Forum Regular

    So if I have 2gb RAM I can't use this?
  19. Prestern Paul

    Prestern Paul Adept Poster - A3

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    even me Techbro i only have like 2GB Ram not until i put more junk into my PC now i got 1.8GB of Ram
  20. Techbro

    Techbro Sturmtiger Staff Member Helper Forum Regular

    None of my ram is used :)
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Where Do I Set Java Args for Minecraft

Source: https://xealgaming.net/threads/optimising-your-minecraft-jvm-arguments.4758/