Fix „Your System Has Run Out of Application Memory” on Mac

Quick answer: Identify the memory-hungry processes with Activity Monitor, quit or relaunch them, free disk space used for swap, and reboot if needed. Follow the steps below for short- and long-term fixes.

What is application memory on Mac?

Application memory on macOS is the RAM that applications and system services use to store active data. It’s not just the physical memory in your machine — macOS also compresses memory and uses disk space as virtual memory (swap) to extend usable memory when physical RAM is low.

The system displays totals like Memory Used, Cached Files, and a memory pressure graph in Activity Monitor. High memory pressure means the OS is struggling and will rely more on swap, which is slower and can trigger alerts like „Your system has run out of application memory”.

Understanding application memory helps you diagnose whether the issue is a temporary spike (one runaway app), chronic insufficient RAM, or disk-space shortage that prevents swap from working efficiently.

Why macOS shows „Your system has run out of application memory”

That message appears when available memory plus swap and compression can’t satisfy current memory allocations. In practice this typically occurs when one or more apps leak memory, a heavy workload uses more RAM than installed, or the startup disk is nearly full so swap can’t expand.

Common culprits: browser tabs and extensions, virtual machines, large photo/video editors, and background helpers. Sometimes a single process (e.g., a crashed helper) will balloon to many gigabytes due to a bug.

macOS isn’t blaming you — it’s warning. Fixes range from quick app restarts to freeing disk space for swap to upgrading physical RAM. The steps below target both immediate relief and persistent prevention.

Quick steps to clear application memory on Mac (fast relief)

Follow these quick, safe actions when you see the error message. They free memory immediately and resolve most transient issues without complex troubleshooting.

• Open Activity Monitor (Applications > Utilities) and sort by Memory to find the biggest consumers; quit or Force Quit processes you recognize as safe to close.
• Close browser tabs and quit apps like Photoshop, Docker, or virtual machines that use large amounts of RAM; relaunch if necessary.
• Restart the Mac if memory is fragmented or core services are stuck. A reboot clears RAM and resets system caches.

If Activity Monitor shows a specific process repeatedly using excessive memory, remove and reinstall that app or check for updates. For browsers, disabling heavy extensions or using fewer tabs reduces memory pressure.

As a quick automation: log out and log back in, or run the Finder’s relaunch (Option‑right-click the Dock icon), which often frees up memory tied to user‑level processes without a full reboot.

Advanced cleanup and prevention (long-term fixes)

If you repeatedly see the error, take these longer-term measures. They reduce the chance of hitting application memory limits again and improve overall responsiveness.

Free disk space: macOS needs free SSD/HDD space to write swap files. Aim to keep at least 10–20% of your drive empty, especially if you run memory-intensive workflows. Remove large unused files, move archives to external drives, or use cloud storage for less-frequently accessed data.

Consider a hardware upgrade: If your Mac allows it, add more physical RAM. On many modern Macs (T2 / Apple Silicon), RAM is soldered and cannot be upgraded — in that case, select machines with more memory next purchase or offload heavy tasks to a more capable machine or cloud VM.

Optimize workflows: Use lighter alternatives (e.g., a streamlined browser or less resource-intensive editors), enable tabs suspension extensions, and avoid running multiple virtual machines concurrently. For persistent leaks, monitor and report bugs to the app vendor.

Diagnose memory usage: tools and commands

Activity Monitor is your primary GUI tool: check the Memory tab, inspect the Memory Pressure graph, and examine Swap Used. A green pressure graph is healthy; yellow or red means the system is strained.

Terminal tools help with deeper dives. Useful commands:

# show basic RAM stats
vm_stat

# top with memory focus
top -o rsize

# list processes sorted by memory (resident size)
ps aux | sort -nrk 6 | head -n 20

Note: older suggestions like sudo purge are deprecated and can have limited benefit; rely on quitting processes, freeing disk, and rebooting. For intermittent leaks, sample a process in Activity Monitor (View → Sample Process) and send the sample to the app developer for analysis.

When to contact Apple or developer support

If you see the message repeatedly after attempting the steps above, and Activity Monitor doesn’t show an obvious culprit, it may be a system-level issue or a hidden background process. Collect logs (Console app) and memory samples before contacting support to speed diagnosis.

If third-party apps are to blame, reach out to the developer with a sample and details about your macOS version and RAM configuration. If the problem appears at login or affects multiple users on the same machine, try creating a new user account — if the error disappears there, it’s likely a user-level preference or launch item.

For hardware concerns (unexpectedly low physical RAM reported, defective memory), Apple Support or an Apple Authorized Service Provider can run hardware diagnostics and advise on repairs or replacements.

Helpful resources and further reading

For a concise technical reference and some community-sourced troubleshooting scripts, see the project notes here: application memory on Mac. The repository includes examples and links to deeper diagnostic techniques.

If you prefer a direct how-to, this guide on clearing application memory is a practical companion: clear application memory on Mac. Bookmark it if you manage multiple Macs or handle resource-heavy apps often.

For community Q&A and user experiences, check macOS forums and Stack Exchange threads about „your mac does not have enough RAM” and memory pressure troubleshooting to see vendor- and model-specific tips.

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FAQ (short, actionable answers)

1. What does „application memory” mean on my Mac?

Application memory is the RAM used by apps and system services, plus memory the OS compresses and uses swap for. It’s the working memory macOS manages to run applications and keep things responsive.

2. How do I quickly clear application memory on Mac?

Open Activity Monitor, sort by Memory, quit or Force Quit the top consumers, close unused browser tabs, free disk space for swap, and reboot if necessary. If a specific app leaks memory, update or reinstall it.

3. My Mac keeps saying „your mac does not have enough RAM”—what next?

First, reduce background apps and free disk space. If the issue persists and your Mac allows upgrades, add RAM. For Macs with soldered memory (most modern models), migrate to a machine with more RAM or offload heavy tasks to a remote/cloud system.