How to Fix “Your System Has Run Out of Application Memory” on Mac

Quick one‑minute fixes to clear application memory on Mac

When macOS warns “your system has run out of application memory,” it means running apps and processes have consumed available RAM and the system is relying heavily on disk swap. The fastest way to stop immediate instability is to close the offending apps and reduce memory pressure.

Open Activity Monitor (Applications > Utilities > Activity Monitor) and choose the Memory tab. Sort by Memory to find the top consumers, select the app or process, then click the stop (⛔) button and choose Quit or Force Quit if it won’t close normally.

Also check Storage in About This Mac > Storage: low free disk space makes virtual memory (swap) less effective. Freeing several gigabytes instantly helps performance and lets the OS manage memory more gracefully until you can apply longer‑term fixes.

• Save work, quit heavy apps, free disk space, then restart.

What is “application memory” on Mac and why it matters

Application memory refers to the RAM your apps use while running. macOS manages physical RAM and complements it with virtual memory on disk (swap). Modern macOS also compresses inactive memory to delay swapping, but when demand exceeds these mechanisms you get the “out of application memory” message.

This message is not a generic bug: it’s a resource exhaustion alert. It can be triggered by a single runaway process, many concurrent memory‑heavy apps (browsers, VMs, large image or video editors), or simply insufficient RAM for your workload. On Macs with unified memory (Apple Silicon), RAM isn’t user‑upgradable, so planning usage is essential.

Understanding the difference between RAM, compressed memory, and swap is practical: RAM is fastest, compressed memory reduces RAM footprint, and swap uses disk (much slower). High swap usage correlates with sluggish response and more frequent warnings.

Diagnosing memory issues with Activity Monitor (the safe approach)

Activity Monitor is the built‑in diagnostic tool. Open it and select the Memory tab. Look at “Memory Pressure” — green is healthy, yellow warns, red means the system is under severe pressure. Check “Memory Used,” “Swap Used,” and the list of processes sorted by memory to identify culprits.

If a specific app is using excessive RAM, quit and relaunch it. If an app repeatedly spikes memory, update or reinstall it; browser extensions and background helper processes are common offenders. For Chrome, consider switching to Safari or using fewer tabs—each tab consumes memory.

When an app won’t quit or is stuck, select it in Activity Monitor and use Quit Process → Force Quit. For advanced users diagnosing background services, inspect the parent process and related helper processes before killing them to avoid unintended side effects.

Practical, longer‑term fixes and prevention

Free disk space: ensure you have at least 10–20% of disk free. Virtual memory needs scratch space; low disk capacity forces excessive swapping. Remove large unused files, clear Downloads, or move media to an external drive or cloud storage.

Minimize background and login items. Go to System Settings (or System Preferences) → Users & Groups → Login Items and disable unnecessary agents. Uninstall or disable apps that launch helpers persistently. Reduce browser extensions and tab count; use an extension that hibernates inactive tabs if needed.

Update macOS and apps: memory leaks are often fixed in updates. If your Mac is an older Intel model with upgradable RAM, increasing physical memory is the most effective permanent solution. On Apple Silicon Macs, consider a model with more unified memory if your workflows demand it.

• Check Login Items, update apps, and consider hardware upgrades if possible.

When to take advanced steps or seek help

If memory pressure and swap remain high after the steps above, collect logs and seek professional help. Reboot in Safe Mode to test whether a third‑party extension or launch agent causes the issue. Safe Mode disables many background items and clears some caches, which can reveal the culprit.

Reinstalling macOS is a last resort but can resolve deep-seated system-level problems. Before reinstalling, back up with Time Machine or another backup solution. If the problem persists on a new user account, it suggests a system‑wide issue rather than a user configuration one.

If you prefer a technical reference or scripts to gather diagnostics, reputable developer resources and community repositories (for example, resources about application memory on mac) can help — but avoid running unfamiliar commands as root. For a quick diagnostics guide and community notes, see this reference on application memory on Mac.

Backlink: application memory on mac

Checklist: step-by-step rescue plan

Follow this prioritized list when you see the error:

1. Save your work immediately. Quit apps that are safe to close.
2. Open Activity Monitor → Memory. Force‑quit the top memory consumers if necessary.
3. Free at least several GB of disk space (empty Trash, move large files off disk).
4. Restart the Mac. If problem recurs, update macOS and target problematic apps.
5. Consider a hardware upgrade (RAM on upgradable Macs) or a newer machine if workflows exceed available memory.

FAQ

What does “your system has run out of application memory” mean?

It means the system’s RAM and compressed memory are exhausted and macOS is relying heavily on disk swap to keep processes running, causing instability. The OS warns you because continued swapping can make the machine extremely slow or cause apps to quit unexpectedly.

How can I safely clear application memory on my Mac?

Save work, open Activity Monitor (Memory tab), identify top memory users, then Quit or Force Quit them. Free disk space and restart the Mac. Avoid running unknown Terminal commands; prefer Activity Monitor and standard macOS controls.

How do I prevent this message from returning?

Reduce memory load: close unused apps and browser tabs, disable unnecessary login items, update apps, and keep free disk space. If you regularly exceed RAM, upgrade physical memory on models that allow it or choose a Mac with more unified memory.