How to allocate more memory to your Minecraft instance
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From the Modrinth launcher, select the Settings button.
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Under Java memory, drag the slider or input the desired amount.
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From the Prism Launcher, make sure to select the right Instance by clicking on it.
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Select Edit on the left.
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Then select the Settings tab on the right.
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Check the Memory box, and set the Minimum and Maximum Memory allocation to the value needed.
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Open the Launcher and verify you’re on the Java Edition section of the launcher.
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Click on the installations tab and find which installation you want to allocate more RAM to.
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Hover over the installation you want to allocate more RAM to and click on the more options (3-dot menu) and click on edit.
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Click on the More Options text.
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Change the number after the argument
-Xmxto allocate more RAM. (i.e.-Xmx1G= 1GB of RAM,-Xmx6G= 6GB of RAM etc.)
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From the TLauncher, select the Settings button in the bottom right corner.
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Click on the Settings text.
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In the Minecraft settings tab under Selection Java, drag the slider or input the desired amount.
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Then click Save.
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From the Feather launcher, select the Settings button in the top right corner.
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In the right corner under allocated ram, drag the slider or input the desired amount.
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From the Lunar Client launcher, select the Settings button in the bottom left corner.
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Under the GAME tab, drag the slider or input the desired amount.
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From the ATLauncher, select the Settings tab on the right.
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In the tab at the top select Java/Minecraft.
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Then change the Maximum Memory/Ram to needed.
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Finely click save down at the bottom.
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From the FTB launcher, select the Settings button on the left.
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Select the Instance Default tab and scroll down to Java
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Drag the slider or input the desired amount.
- @TVcraft01 contributing to this wiki page