Minecraft Forums

How to allocate more RAM (memory) to Minecraft

Based on this post by this user, updated and corrected for 1.20+.

These are some basic steps on how to allocate more RAM to your game.

Step 1 - Open the Launcher.

Step 2 - Click the 'installations' button

Step 3 - Choose the profile you want to allocate more RAM to (e.g. Latest Release)

Step 4 - Click the 'more options' button

Step 5 - You will see alot of text, only concentrate on the first line saying -Xmx2G

Step 6 - Replace 2G with how much RAM you want to allocate (e.g. "4G" = 4GB of RAM allocated)

Attention:

32-bit system only supports up to 4GB RAM memory. Therefore, most 32-bit based systems only support a maximum of 2GB to be allocated to Java. The limit depends on the system, if you got an error, try less allocation.



If you are not using the native Java that comes with the launcher, be sure to use the latest and correct version of Java (64bit on 64bit-OS-Systems is recommended).

How much RAM do I have?

The easiest way to see how much RAM you have on Windows is to open the Task Manager and change to the Performance Tab. Look how much Physical Memory is available. On MacOS, go to the Apple Menu, select About This Mac. This window shows you your total amount of RAM.



Note that other programs and your system also need RAM to work. For example, if you run TeamSpeak or Firefox in background, you should leave enough memory for this software to run.

Some numbers for reference:

• Windows 7: 1 GB RAM (32-Bit) or 2 GB RAM (64-Bit)
• Windows 8 / 8.1: 1 GB RAM (32-Bit) or 2 GB RAM (64-Bit)
• Windows 10: 2 GB RAM
• Linux: 1-2 GB
• Skype: 256 MB
• Teamspeak: 64 MB

It is recommended to never allocate more than half your system RAM to the game. Also be aware that allocating more RAM does not necessarily make the game faster.

Something doesn't work? You got an error?

• First of all check for spelling mistakes. Also important: JVM arguments are case-sensitive
• Try to install the non-native version of Java (the download can be found here).
If you go that, make sure to set your "Java Executable" in the launcher
to the non-native javaw.exe (e.g. if you installed Java 17.0.6.10, set
it to C:\Program Files\Eclipse Adoptium\jdk-17.0.6.10-hotspot\bin\javaw.exe). Please note that Java 9 and above are not yet fully supported.

• Add -Xms1G and try again
• Lower the numbers if your issue still persists.
• Check if you've enough free RAM, and make sure you use 64-bit when allocating more than 2GB or RAM.

You found a fault in the post? Something is missing? Please let me know via a reply here.

Start fresh without any mods and try adding half the datapacks. if that works, add some more until you find the datapack causing the issue.

If all datapacks work fine without mods, add half the mods and see if there's an issue. If not, add some more until you find the mod causing the issue.

Please follow these instructions to obtain a Minecraft Launcher log: https://minecrafthopper.net/help/guides/getting-minecraft-launcher-log/

Remove the CustomMainMenu mod and see if the issue still occurs.

It looks like some of your mods have been downloaded from sites such as 9minecraft.

9minecraft is a website known to steal mods and even include malware in some downloads. Run a scan with https://www.malwarebytes.com/mwb-download/ and redownload the mods from curseforge.

First of all, don't use badlion. It's a 3rd party client and infact has been called a rootkit before due to how it installs itself. (installs at the kernal level and monitors everything)

It's the client itself that's causing the crash so stop using it and go back to using the official launcher from https://minecraft.net

See the above comment from ConorGarland

Can you send a screenshot of your JVM arguments and your F3 screen ingame?

No problem!

Did you remove Chisel? If so, then put it back and install the "ConnectedTexturesMod" because it's required.

You can get the mod here: https://minecraft.curseforge.com/projects/ctm

Did you try to install the version the game recommends? I do get this error myself from time to time and did just that.

I think the most useless mob in the game would have to be the Giant.
They cannot spawn, due to the spawning code having contradicting numbers, and even if you do spawn them they don't do much. They have a terrible hitbox and you die if you stand near their feet. They don't have any loot, and they're only real use is to make them hold items with command blocks, which they then turn massive, however they just sway the item back and forth quite a lot! It's terrible!

Quote from Gephire»

Ty so much , can I +1 you or smth like that ?

While technically mobs spawn more often the lower the spawning spaces are, the entirety of that difference is on the order of...5 more mobs.