Minecraft Java 26.4 Now Sets RAM Automatically, Up to 4 GB

Minecraft Java Edition is taking memory settings into its own hands. In the 26.4 test versions, the game now sets its Java heap size automatically based on how much RAM the computer has.

The change gets a single line in the official 26.4 Snapshot 6 notes, yet it touches many PC players, especially anyone who has ever searched for how to give Minecraft more RAM. Here is how the limit works and what to check.

What Changed in Snapshot 6?

In the release notes published on October 27, 2026, Mojang wrote, The game now automatically sets its Java heap size based on your system's RAM, using up to 25% with a maximum of 4 GB. Put simply, the game now decides its own share of Java memory based on the computer's RAM.

The heap is the area of memory where Java keeps data the game is using, such as world chunks, entities, and other objects. A heap that is too small makes the game clear memory more often, which can cause stutter. One that is too large on a low-RAM computer leaves other applications competing for memory.

We also compared Mojang's official version files for Snapshot 5 and Snapshot 6. The JVM argument lists in both are identical and contain no -Xmx setting. The release notes do not explain the mechanism either, so the implementation details cannot be confirmed from official sources.

Heap Size by RAM Capacity

This table works out the upper limit using the 25 percent rule and the 4 GB cap. Because Mojang says "up to," the amount the game actually uses may be lower.

Editorial calculation based on the 26.4 Snapshot 6 notes. Advertised RAM is usually slightly higher than what the system actually reports.

Computers with 16 GB or more reach the top limit. Going from 16 GB to 32 GB will not raise this automatic cap.

Who Is Most Affected?

Vanilla players on 16 GB or more probably benefit the most, since the game gets more breathing room with no extra setup. It also helps anyone who has never opened the JVM arguments menu.

Owners of 4 GB computers need to be more careful. A 1 GB limit may feel tight, especially at higher render distances. The simplest fix is to close other applications and lower the render distance before changing memory settings.

Players of large modpacks should check what their pack needs. The 4 GB automatic cap may not be enough, so the modpack author's recommendation remains the main guide.

How to Set Minecraft RAM Manually

In the Minecraft Launcher, open the Installations tab, choose your profile, and click Edit. Open More Options and find the JVM Arguments field. The -Xmx value there sets the maximum heap size, for example -Xmx4G for 4 GB.

In Java generally, -Xmx is the way to set the heap limit explicitly. Mojang's notes do not detail how it interacts with the new automatic rule, so check the JVM Arguments field after updating, especially on older profiles.

Do not set the value to your computer's full RAM. The operating system, your browser, and parts of the game outside the heap also need memory, so a value that is too high can make things worse.

How to See Memory Use In-Game

The F3 debug screen shows memory use while you play. Mojang redesigned the F3 screen in 26.4 Snapshot 2, so the information may sit in a different place than older tutorials show.

If memory use keeps climbing toward the limit and the game stutters often, that is the time to consider a higher allocation. This change also comes alongside the graphics shift in the 26.4 series. Vulkan has been the default since Snapshot 1, although Snapshot 7 temporarily randomizes the Default option between OpenGL and Vulkan for testing.

When Will This Reach the Stable Version?

The setting is still in snapshots, and the stable Java release when we checked on November 9, 2026 was 26.3. Mojang has not announced a release date for 26.4, and snapshot contents can change before the final version.

Players who want to try it can enable snapshots in the Minecraft Launcher. Back up your worlds first and use a separate profile, because a world opened in a test version may not be safe to use in an older one. This change applies only to Java Edition, so Bedrock players on mobile, console, and Windows are not affected.

Conclusion

Automatic heap sizing makes Minecraft Java easier for players who would rather not touch the launcher. Low-RAM users and modpack players will still want to check the right figure for their computers when this reaches the stable version.