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I changed my Java XMX to have 2GB of RAM because I hate the lag I'm getting, but I get a strange error message:

Error occurred during initialization of VM
Incompatible minimum and maximum heap sizes specified
Picked up _JAVA_OPTIONS: -Xmx512M

My commandline:

-Xmx2G -Xms2G

Whatever this _JAVA_OPTIONS is, it's overriding my XMX setting. I've looked through all of my Windows configs, but I have been unable to find it. Why is it happening, and how do I fix it?


I have no environment variable named _JAVA_OPTIONS in my system that I can see.


Upon further testing, this only happens with the Minecraft exe file. When lanuching the Launcher JAR, it works perfectly.

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    -Xmx specifies the maximum heap size. -Xms specifies the initial heap size - that means the memory that will be allocated even if it is not needed right now. Try decreasing -Xms. Dec 7, 2014 at 13:23
  • @MinecraftShamrock The problem is that something is overriding the Java Options I'm setting. I want to remove this override.
    – Kaz Wolfe
    Dec 7, 2014 at 21:58
  • Are you launching it using a script or using the "additional java options" in the launcher?
    – user28379
    Dec 9, 2014 at 0:54
  • @JeffreyLin Additional Java Options
    – Kaz Wolfe
    Dec 9, 2014 at 1:48

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According to this, it's due to Razer. If you have Razer programs open, shut them all down & try again.

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