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How to Allocate More RAM to a Minecraft launcher

Last modified on Jul 12, 2023 in General

mc head By Nathan Young


Minecraft is a highly flexible game that allows users to customize almost everything about it. This is typically done with mods, which are required on the launcher. These need either Forge or Fabric versions of Minecraft to fully work, but may need more memory. Many players try to load large collections of mods in the game, known as modpacks, which can create lag or other performance issues. This is mainly caused by an insufficient amount of RAM allocated to the Minecraft launcher. Whether you’re using the default client or a modded one like CurseForge, allowing extra memory is a universal feature that helps resolve problems. With this in mind, we’ve created this Apex Hosting tutorial to show you how to allocate more RAM on Minecraft through several popular launchers.

The Significance of RAM

Out of Memory in Minecraft

As briefly mentioned above, having very little allocated memory to your launcher can result in some performance issues. These can range from a decrease in FPS to the client entirely crashing mid-game. Preventing problems like these is an important part of the gameplay, especially when you’re adding a lot of mods to Minecraft. For example, having a large modpack with low RAM will result in terrible frames and likely make everything unplayable. Occasionally, crashing could happen if nothing is done about the situation.

Adding More RAM to Minecraft

Luckily, memory allocation for your launcher is really straightforward. However, due to the multiple different platforms to use, there’s going to be some differences between them. Regardless if you’re using vanilla or a custom launcher, it’ll be easy to allocate more RAM. Choose your client from one of the sections below to begin adding extra memory.

Default Launcher

  1. Start your Minecraft launcher, then head towards the Installations area.
    Minecraft Launcher Installations
  2. Locate your desired profile and click the three dots to the right.
    Minecraft Launcher Optifine Profile
  3. On the next screen, press More Options under Resolution.
    Minecraft Launcher Profile Options
  4. Scroll down to JVM Arguments, then locate the -Xmx2G parameter.
    Minecraft RAM Options
  5. Proceed to change “2G” to “4G” or another reasonably high value.
    Note: This represents the amount of memory to allocate, which is 2gb by default.
  6. Afterward, press Save at the bottom right to apply the changes.


CurseForge App

  1. Start the CurseForge App, then click the Settings button at the bottom left.
    CurseForge App Settings
  2. In the next screen, select Minecraft under the Game Specific section.
    CurseForge App Minecraft
  3. Afterward, scroll down until you see the Java Settings category.
  4. Once there, adjust the bar for the Allocated Memory area to increase RAM.
    CurseForge Minecraft RAM
  5. When you’re finished, click the X button at the top right corner to save the changes.



  1. Open the VoidLauncher and click Options in the top right corner.
    VoidLauncher Options
  2. On the next page, select your desired memory size in Minecraft Options.
    Voidswrath Minecraft RAM
  3. After picking one, return to your modpack to begin playing with higher memory.



  1. Start ATLauncher and wait for it to fully load, then click Settings to the bottom right.
    ATLauncher Settings
  2. Afterward, continue to the Java/Minecraft category at the top.
    ATLauncher Minecraft
  3. Once there, locate and change Maximum Memory/Ram to your desired value.
    ATLauncher Minecraft RAM
  4. When you’re done, click Save at the very bottom to apply the changes.


Technic Launcher

  1. Start up Technic, then press Launcher Options at the top right.
    Technic Launcher Options
  2. In the new window, select the Java Settings category.
    Technic Launcher Java Settings
  3. From here, choose your desired value in the Memory dropdown menu.
    Technic Launcher RAM
  4. When you’re done, simply close down the prompt and begin playing.



  1. Open the FTB App and click Library from the top left corner.
    FTB App Library
  2. Find your desired modpack instance, then select it from the list.
  3. Afterward, click Settings near the right side of the screen.
    FTB App Settings
  4. From here, adjust the bar in the Instance Memory section to allocate RAM.
    FTB App Minecraft RAM
  5. When you’re done, return to your modpack instance to start playing.


Common Issues

Unable to Allocate Above 2GB

Sometimes, players will have the incorrect Java version installed on the computer. This could result in memory allocation issues, such as being unable to go above 2GB. If this happens to you, then download an updated Java build here and try again. Make sure to close the launcher and re-open it to see if that works, but can still sometimes encounter issues. If nothing seems to be working, then try reinstalling the client and/or profile instance. Otherwise, there could be an underlying problem with your machine.

Minecraft is Crashing / Lagging

In cases where your game is crashing or lagging, the issue is still likely not enough RAM. Try increasing it through your launcher options, then see if that works. However, it’s strongly recommended that you don’t set the RAM’s value to the maximum. This could create unintended problems that wouldn’t help your situation. In other words, keep your memory within reasonable limits.

Useful Links

How to Install Forge to Minecraft
Installing Fabric on the Minecraft Launcher
How to Install Mods to a Minecraft Server

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