Java Arguments

Performance

Use these arguments to potentially improve performance of Minecraft:

• -Xms | -Xmx-> These values set the Minimum and Maximum amount of RAM memory Java is allowed to use.

  
  

  It's not recommended to allocate more than 10 Gigabytes unless using Shaders, using too much RAM will potentially overload the Garbage Collector.

  
  

  Example usage:

  
  

  -Xms4g -Xmx4g-> 4 GB

  
  

  -Xms6g -Xmx6g-> 6 GB

  
  

  -Xms8g -Xmx8g-> 8 GB

  
  

  -Xms10g -Xmx10g-> 10 GB

  
  

  For most ModPacks, 6 or 8 GB is plenty.

  
  

• -XX:+AlwaysPreTouch

  
  

  In Minecraft context

  
  

  Reduces stutters during gameplay.

• -XX:+UseStringDeduplication

  
  

  In Minecraft context

  
  

  Saves RAM memory on repetitive string objects, like Block names.

  
  

• -XX:-OptimizeStringConcat

  
  

  In Minecraft context

  
  

  May improve performance in heavy string usage, such as Logs, Chat, and Mod internals.

Setting Arguments

If using a Launcher, you can set Java args in the settings, or for individual Instances.