If Minecraft keeps stuttering, crashing mid-game, or taking forever to load chunks — there’s a decent chance it just doesn’t have enough memory to work with. By default, the official launcher only gives Minecraft around 2GB of RAM, which is fine for vanilla gameplay but starts to crack under the weight of mods, large render distances, or busy multiplayer servers.
The fix is straightforward: tell the launcher to use more. This guide walks you through exactly how to do that across every major launcher — the official Minecraft Launcher, CurseForge, ATLauncher, and MultiMC/Prism — and covers what you can (and can’t) do on Bedrock Edition.
First: Java Edition Only — Bedrock Is Automatic
Before diving in, one thing worth knowing upfront: manually allocating RAM only applies to Minecraft Java Edition.
Bedrock Edition — which runs on Windows 10/11, consoles, mobile, and Chromebook — manages memory automatically. It grabs what it needs from your system without any input from you. There’s no JVM arguments box, no slider, no setting to change. If Bedrock is running sluggishly, the fix isn’t RAM allocation — it’s things like lowering render distance, closing background apps, or checking whether your hardware meets the game’s requirements.
Everything below is for Java Edition. If that’s you, keep reading.
And if you’re also dealing with multiplayer setup questions — like playing across devices with friends — our Minecraft cross-platform guide covers that from top to bottom.
How Much RAM Should You Give Minecraft?
More RAM isn’t always better. Java has to manage and clean its memory pool periodically — a process called garbage collection — and if the pool is too large, those cleanup pauses actually make the game stutter more, not less.
Here’s a sensible guide by setup:
| Setup | Recommended RAM |
|---|---|
| Vanilla (no mods) | 3–4 GB |
| Small modpack (under 50 mods) | 4–6 GB |
| Large modpack (100+ mods) | 6–8 GB |
| Very heavy modpack / shaders | 8–10 GB |
Note for modpack players in 2026: The 2GB default is increasingly inadequate. Many modern modpacks — particularly those with 200+ mods, custom world generation, or shader integration — now list 6–8 GB as their minimum requirement and simply won’t load at the default 2GB. If you’re installing a modpack and it crashes immediately on launch, insufficient RAM is almost always the first thing to check. Read the modpack’s “About” or “README” page on CurseForge or Modrinth — the RAM minimum is usually listed there.
⚠️ Golden Rule: Never give Minecraft more than 50% of your total system RAM. Your OS, browser, Discord, and other background apps all need memory too. On a 16 GB machine, cap Minecraft at 8 GB. On 8 GB, keep it at 3–4 GB max.
💡 Pro Tip: If you have plenty of RAM but still notice stuttering every few seconds, the issue is likely garbage collection pauses — not lack of memory. Giving Minecraft even more RAM at that point actually makes it worse. The fix is better JVM flags (covered at the end of this guide), not a higher number.
💡 Heads Up for Integrated Graphics Users (Intel/AMD iGPU): Mojang announced in February 2026 that Minecraft Java Edition is transitioning from OpenGL to a Vulkan-based renderer to support the upcoming Vibrant Visuals update, with snapshot testing beginning summer 2026. On dedicated graphics cards this will improve performance. But if you’re on a laptop or desktop with integrated graphics — where your CPU and GPU share the same pool of system RAM — this makes RAM management more important than ever. Your integrated GPU already reserves a slice of your system RAM for VRAM. If you have 8 GB of system RAM and your integrated GPU is using 1–2 GB of it, you effectively have 6–7 GB available for everything else. Be more conservative than the table above suggests — on an 8 GB integrated graphics machine, allocating 3–4 GB to Minecraft (not 6 GB) leaves enough headroom for both your OS and GPU to function properly.
To check how much RAM your PC actually has: on Windows, right-click the Start button → System → look for “Installed RAM.” On Mac, go to Apple menu → About This Mac.
Method 1: Official Minecraft Launcher
This is the method for players using the standard launcher from Minecraft.net. It covers all Java Edition profiles including vanilla, Fabric, and Forge installs launched through the official app.
Step 1: Open the Minecraft Launcher and make sure you’re on the Java Edition tab in the left sidebar — not Bedrock.
Step 2: Click Installations at the top of the launcher.
Step 3: Find the installation profile you actually use — this might be “Latest Release,” a Fabric profile, or a Forge version. Hover over it and click the three dots (…) that appear, then select Edit.
Step 4: In the Edit Installation window, click More Options at the bottom to expand the advanced settings.
Step 5: Look for the JVM Arguments text box. You’ll see a string of text that includes something like -Xmx2G near the beginning. That’s what controls the RAM ceiling.
Step 6: Change the number in -Xmx2G to whatever you want to allocate. For example: -Xmx4G for 4 GB, -Xmx6G for 6 GB, -Xmx8G for 8 GB.
Step 7: Click Save and launch the game.
💡 How to verify it worked: Once in-game, press F3 to open the debug screen. Look in the top-right for a line that says something like
Mem: 1200/4096MB. The second number is your ceiling — if it matches what you set, you’re good.
Method 2: CurseForge Launcher
CurseForge is the most common launcher for modpack players, and it handles RAM allocation slightly differently depending on whether you want a global default or per-modpack settings.
Global setting (affects all modpacks):
Open CurseForge → click the Settings icon (gear) at the bottom left → under Game Specifics in the left sidebar, click Minecraft → scroll down to Java Settings → drag the Allocated Memory slider to your desired amount → changes save automatically.
Per-modpack setting (recommended for big modpacks):
Go to the My Modpacks tab → find the modpack you want to adjust → click the three dots (…) next to it → select Profile Options → enable Custom RAM Allocation → set your preferred amount → click Done.
The per-modpack option is handy because a massive modpack might need 8 GB while a lighter one only needs 4 GB — you don’t want a single global setting forcing everything to run at the high end. Always check the modpack’s recommended RAM before launching it for the first time.
Method 3: ATLauncher
ATLauncher lets you set RAM globally or per-instance, similar to CurseForge.
Global setting:
Open ATLauncher → click Settings in the sidebar → go to the Java/Minecraft tab → change Maximum Memory/RAM to your desired amount.
Note: ATLauncher lists RAM in megabytes, not gigabytes. Use these conversions: 4 GB = 4096 MB, 6 GB = 6144 MB, 8 GB = 8192 MB.
Per-instance setting:
Click Instances in the sidebar → click the Settings button for the specific instance → go to the Java/Minecraft Settings tab → change Maximum Memory/RAM there.
Method 4: MultiMC / Prism Launcher
MultiMC and its fork Prism Launcher are favorites among players who like clean, separated Minecraft instances. In 2026, Prism has largely taken over as the go-to choice in the enthusiast space thanks to better API support and more active development — but the RAM allocation process works the same way in both.
Global setting:
Open MultiMC or Prism → go to Settings from the top menu or sidebar → click the Java tab → find Maximum memory allocation and set it to your desired amount (in MB — same conversions as ATLauncher above) → close Settings.
Per-instance setting (overrides global):
Right-click the instance you want to adjust → select Edit Instance → click Settings on the left → check the box next to Memory to enable override → set your Maximum memory allocation → it saves automatically, no button needed.
The per-instance approach in MultiMC/Prism is one of the cleanest ways to manage RAM if you run multiple different modpacks, since each one can have exactly the memory it needs without affecting others.
What to Do If You’re on Bedrock (Windows, Console, Mobile)
As mentioned at the top, Bedrock handles memory on its own. But if your Bedrock game is running poorly, here are the practical things you can actually do:
Lower render distance — This is the single biggest performance lever in Bedrock. Go to Settings → Video → and pull the render distance slider down. Even dropping from 16 to 12 chunks can make a noticeable difference.
Close background apps — Browsers, Discord video calls, streaming apps — anything using RAM or CPU in the background will affect Bedrock since it can’t be given a dedicated memory cap. Close what you don’t need.
Check your storage — Bedrock can slow down dramatically when your device’s storage is nearly full. It needs free space to write chunk data. Clearing space on your drive often helps more than people expect.
Enable Game Mode on Windows — If you’re on Windows 10/11, go to Settings → Gaming → Game Mode and make sure it’s turned on. This tells Windows to prioritize resources for whichever game is in focus.
Update your drivers — Outdated graphics drivers cause stuttering in Bedrock more often than RAM does. Keep your GPU drivers current, especially if issues appeared after a Minecraft update.
If you’re playing cross-platform Bedrock with friends and running into connection issues rather than performance issues, the fix is different — check out our full Minecraft cross-platform guide for troubleshooting that.
Bonus: Better JVM Arguments (For Java Players Who Still Stutter)
If you’ve set a reasonable RAM amount but still get periodic lag spikes or brief freezes every minute or so, the culprit is almost always garbage collection — Java pausing the game to clean up memory it’s no longer using.
For Minecraft running on Java 21 (which covers all 26.x versions in 2026), you can add these arguments to your JVM Arguments box after your -Xmx setting:
-XX:+UseZGC -XX:+ZGenerationalThis switches Minecraft to the Generational ZGC garbage collector, which cleans memory in the background without pausing gameplay. It’s particularly effective if you have 8 GB or more allocated and were getting regular freezes.
Add these after your existing -Xmx value in the JVM Arguments box and save. The line might look something like:
-Xmx6G -XX:+UseZGC -XX:+ZGenerational⚠️ Note: These flags are for Java 21 and newer. If you’re on an older Java version or an older Minecraft version, they may not work or may cause launch issues. Stick to vanilla JVM settings if you’re unsure.
Common Problems and Fixes
Game won’t launch after changing RAM: You’ve likely allocated more than your system actually has free. Reduce the number and try again. Never go above 75% of your total RAM, and ideally stay at 50% or below.
Can’t allocate more than 2 GB: This usually means you’re running a 32-bit version of Java, which has a hard 2 GB ceiling. Download the 64-bit Java from java.com and make sure your launcher is pointed at it. In the official launcher you can check this under More Options → Java executable path.
Game crashes after increasing RAM: Try going slightly lower. Ironically, allocating too much RAM can cause more issues than too little — especially on systems where other processes compete for memory.
Stuttering even with plenty of RAM: Don’t keep increasing RAM. This is a garbage collection issue, not a memory shortage. Try the ZGC flags mentioned above, or reduce render distance and entity loading settings instead.
Changes don’t seem to take effect: Make sure you’re editing the correct installation profile. If you have multiple profiles (e.g., a vanilla one and a Fabric one), changes to one don’t affect the other.
Modpack won’t launch at all: Check the modpack page for its minimum RAM requirement — in 2026, many heavy modpacks require 6–8 GB just to get past the loading screen. If you’re still on the 2 GB default, that’s your problem.
Quick Reference: RAM by Launcher
| Launcher | Where to Change RAM |
|---|---|
| Official Minecraft Launcher | Installations → Edit → More Options → JVM Arguments (-Xmx) |
| CurseForge | Settings → Minecraft → Java Settings → Allocated Memory slider |
| ATLauncher | Settings → Java/Minecraft → Maximum Memory/RAM (in MB) |
| MultiMC / Prism Launcher | Settings → Java → Max Memory, or per-instance via Edit Instance |
Final Thoughts
For most vanilla players, bumping from 2 GB to 4 GB in the official launcher is all it takes to smooth out the experience noticeably. Modpack players generally want 6–8 GB depending on pack size — and in 2026, checking the modpack’s listed minimum before you even hit launch is just good habit. Just remember to leave enough headroom for your OS and other running apps, and if you’re on integrated graphics, be extra conservative since your GPU is sharing that same memory pool.
If you’re still running into performance issues after sorting RAM, it’s worth checking whether you’re also dealing with server-side lag rather than a client issue. Setting up your own server properly — or joining a well-hosted one — makes a bigger difference than people expect. Our guide on how to make and join a Minecraft server walks through that side of things.
And if mods are why you needed more RAM in the first place, our Minecraft mods installation guide covers how to get them set up cleanly without the usual headaches.
Frequently Asked Questions
Can you allocate more RAM to Minecraft Bedrock?
No. Bedrock Edition manages memory automatically. There’s no setting, slider, or argument to change. Focus on lowering render distance and closing background apps if Bedrock is running slowly.
How much RAM does Minecraft Java need?
Vanilla Java runs fine on 3–4 GB. Small modpacks need 4–6 GB. Large modpacks with 100+ mods typically need 6–8 GB. Going above 10 GB rarely helps and can cause longer garbage collection pauses.
Does allocating more RAM always improve performance?
Not always. Too much RAM causes Java to spend longer cleaning its memory pool, which creates brief freezes. The sweet spot is enough RAM that the game doesn’t run out — but not so much that garbage collection becomes a bottleneck.
What does -Xmx mean in JVM arguments?
It stands for “maximum heap size” — essentially the ceiling on how much RAM Java will use for Minecraft. -Xmx4G means 4 GB, -Xmx6G means 6 GB, and so on.
Will allocating more RAM speed up chunk loading?
Yes, to a point. More RAM means more chunks can be held in memory at once, which reduces how often the game needs to load from disk. But render distance settings and SSD vs HDD speed matter just as much here.
What’s the minimum RAM to run Minecraft Java?
Mojang officially recommends at least 4 GB of system RAM to run Java Edition, with 8 GB recommended. For the game itself, the default 2 GB allocation works for vanilla but is too tight for most modpacks.
What is the Vulkan update and does it affect RAM?
Mojang announced in February 2026 that Java Edition is switching from its old OpenGL renderer to Vulkan, a modern graphics API. Snapshot testing begins summer 2026. For most players it will improve performance once fully live. The main RAM consideration is for integrated graphics users — since Vulkan interacts more closely with GPU memory, and integrated GPUs share system RAM, those players should be more conservative with how much they allocate to Minecraft and leave more headroom for the GPU side.
Why won’t my modpack launch even after increasing RAM?
Check the modpack’s page on CurseForge or Modrinth for its stated minimum RAM requirement. Many 2026-era heavy modpacks require 6–8 GB minimum. If you’re still below that threshold, the modpack will crash at the loading screen regardless of other settings.
