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From Pixelmon Wiki
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By default, Minecraft starts up with only 1 GB of memory to work with. While Pixelmon may run with the default allocation, allocating more often helps performance and stability. This is especially true when also running other mods. This quick guide will guide you through the process.

Stuck on 1 GB? A 64 bit install of Java is required to be able to allocate more than 1 GB of memory. You can get a 64 bit Java download for your operating system by clicking this link. If you run Windows, make sure you get Windows Offline 64 bit specifically! Restart your launcher after updating.

AT Launcher

Step Example
Start the AT Launcher.
Attutorial1.png
Click on "Settings".
Attutorial2.png
Click into the "Java/Minecraft" tab.
Attutorial3.png
Click the "Maximum Memory/Ram" box and pick a higher setting. Check the note at the top of this page if you're unable to allocate more than 1GB.
Attutorial4.png

Technic launcher

Step Example
Start the Technic launcher.
Techniclauncher.png
Click on "Launcher Options".
Technictutorial1.png
Click into the "JAVA SETTINGS" tab.
Technictutorial2.png
Click the "Memory" box and pick a higher setting. Check the note at the top of this page if you're unable to allocate more than 1GB.
Technictutorial3.png

Minecraft launcher

Step Example
Start the Minecraft launcher.
Newlauncher.PNG
Click on "Installations".
Newtutorial1.PNG
Click on your Pixelmon Forge profile.
Newtutorial2.PNG
Click More options.
Newtutorial3.PNG
Replace "-Xmx1G" with a higher amount,

such as "-Xmx3G" (or "-Xmx3000M").

Newtutorial4.PNG
Click "SAVE" to save your settings
Newtutorial5.PNG

If you get stuck on any of these steps, or are having trouble finding the right amount to allocate or getting the game to run smoothly, check out the Fixing memory issues page or ask for help in the official Pixelmon Discord.

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