If you are experiencing the dreaded "lag spike of death," stuttering frame rates, or outright crashes when loading new chunks, you aren't alone. As Minecraft continues to evolve—especially with the shift to the new 2026 versioning system (like the 26.1 "Tiny Takeover" drop) and increasingly complex modpacks—the default settings just don't cut it anymore.

By default, the standard Minecraft launcher only allocates 2GB of RAM to the game. While this was fine a decade ago, it is rarely enough for modern gameplay, let alone running heavy mods or high-end shaders.

Fortunately, the fix is incredibly simple. Changing a single setting in your launcher can double your performance and eliminate stuttering. Here is the ultimate 2026 guide on how to allocate more RAM to Minecraft across all major launchers.

How Much RAM Does Minecraft Actually Need?

Before you start tweaking settings, you need to know your target number. Allocating the correct amount of RAM depends entirely on how you play the game.

• Vanilla Minecraft (Unmodded): 2GB to 4GB is the sweet spot for a smooth, standard experience.
• Lightly Modded (10-50 mods): 4GB to 6GB will keep your game running smoothly without bottlenecks.
• Heavy Modpacks (e.g., All The Mods, RLCraft, Better MC): 8GB to 10GB is practically mandatory to prevent crashes during startup.

⚠️ The "Too Much RAM" Warning

It sounds counterintuitive, but allocating too much RAM to Minecraft will actually make your game lag worse.

Minecraft runs on Java (note: version 26.1+ now requires Java 25), which uses a process called "Garbage Collection" to clear out unused memory. If you allocate 16GB of RAM to a basic Vanilla game, Java will wait until all 16GB are full before dumping the "garbage" memory. When it finally does, your game will freeze for a second or two, causing massive stuttering.

The Golden Rule: Never allocate more than 50% to 75% of your PC's total system RAM to Minecraft, and rarely allocate more than 10GB unless you are running a massive custom modpack.

How to Check Your PC's Total RAM

If you don't know how much memory your computer actually has, you need to check before changing any Minecraft settings.

• Windows: Right-click the Start button and open Task Manager. Click on the Performance tab, then select Memory. Your total RAM will be displayed in the top right corner.
• Mac: Click the Apple Menu in the top-left corner of your screen and select About This Mac. Your total memory will be listed right there.

How to Allocate More RAM (By Launcher)

Here is exactly how to change your memory limits depending on the launcher you use to play the game.

A. The Default Minecraft Launcher

If you launch the game straight through the official Microsoft/Mojang launcher, follow these steps:

1. Open the launcher and navigate to the Installations tab at the top.
2. Hover your mouse over the game version you want to play, click the three dots (...) on the right side, and select Edit.
3. Click More Options at the bottom of the screen to reveal the JVM Arguments box.
4. Look at the text in the JVM box. At the very beginning, you will see a code like -Xmx2G (the '2G' stands for 2 Gigabytes).
5. Change the number to your desired RAM limit. For example, change it to -Xmx4G for 4GB or -Xmx8G for 8GB.
6. Click Save in the bottom right corner.

B. CurseForge App (Best for Modpacks)

CurseForge has updated its UI recently, making it easier than ever to manage your modpack memory.

1. Open the CurseForge app and click the Gear icon (Settings) in the bottom left corner.
2. Under "Game Specific" on the left menu, select Minecraft.
3. Scroll down to the Java Settings section.
4. Tip: You can toggle on "Use mod pack author's recommended RAM settings" if you want the app to handle it automatically.
5. To set it manually, locate the Allocated Memory slider.
6. Slide it to your desired MB amount. (Remember: 1GB = 1024MB. So, 4096 MB = 4GB, and 8192 MB = 8GB). Your settings will save automatically.

C. Prism Launcher

Prism remains the go-to lightweight, open-source launcher for power users.

1. Open Prism Launcher and click Settings on the top navigation bar.
2. Select the Java tab from the left-hand menu.
3. Look for the Maximum memory setting.
4. Adjust the value (in MB) to your target RAM limit (e.g., 8192 MB for 8GB) and close the settings window.

How to Allocate RAM for a Minecraft Server

If you are hosting a server for your friends, the rules are slightly different. Because servers don't have to render graphics, they rely heavily on CPU single-core performance and optimised RAM allocation.

• Vanilla / Paper Servers: Paper is highly optimised in 2026. For a standard survival server with 1 to 10 players, 4GB is usually plenty of headroom.
• Modded Servers (Forge/Fabric): Modded servers eat memory. Plan for 6GB to 10GB depending on the pack. A safe rule of thumb is: ~2GB base memory + 200MB per player.
• How to set it: You need to edit your server's startup script (usually named start.bat on Windows or start.sh on Linux). Open the file in a text editor and find the JVM arguments. Change the -Xms (starting RAM) and -Xmx (maximum RAM) values to match your needs—e.g., -Xms128M -Xmx6G.

How to Verify Your New RAM Settings Are Working

Don't just assume it worked—verify it in-game!

1. Launch Minecraft using your updated profile and load into a world.
2. Press F3 on your keyboard (on some laptops, you may need to press Fn + F3; note that this functions the same regardless of EU regional keyboard layouts like AZERTY or QWERTZ) to open the debug screen.
3. Look in the top-right corner of the screen for the Mem: stat.
4. It will display a percentage followed by two numbers. For example: Mem: 24% 1950/8192MB. If the second number (the maximum available) matches the amount you allocated (8192MB = 8GB), you have successfully upgraded your RAM!

Troubleshooting & FAQ

Why won't my game launch after allocating more RAM?

This almost always means you allocated more RAM than your PC actually has available to give, or you accidentally deleted part of the JVM argument code. Double-check your system specs and make sure the -Xmx code is formatted perfectly.

Does more RAM increase FPS in Minecraft?

No, not directly. Increasing RAM fixes stuttering, eliminates "lag spikes," and allows chunks to load faster. If you want raw FPS increases or want to run extreme shaders, you need a better CPU or GPU.

Why does my launcher use MB instead of GB?

Computers measure memory in Megabytes (MB). To keep things simple, just multiply the gigabytes you want by 1024. (e.g., 6GB x 1024 = 6144 MB).

Conclusion

Allocating more RAM to Minecraft is the single easiest way to stabilise your gameplay, whether you are exploring vanilla realms or loading up 300+ mods. Just remember the golden rules: Find your specific launcher's settings, change the maximum memory limit, and never starve your PC's operating system by giving Minecraft everything you have.