Your System Has Run Out of Application Memory on Mac: What It Means, Why & How to Fix

Part 1. What Does “Your System Has Run Out of Application Memory” Mean on Mac?

When your Mac shows “your system has run out of application memory, ” it has used up all available RAM and virtual memory resources to run apps smoothly. This can cause slow performance, freezing or even app crashes.

To fully understand this error, you need to know what application memory is and how macOS handles it.

1. What Is Application Memory on Mac?

Application memory refers to the part of your Mac’s RAM that is used to run active applications and background processes. When you open an app, macOS allocates memory to that program to run tasks efficiently. If your RAM is full, your system uses a portion of your storage as virtual memory to manage the extra load. This allows your Mac to continue running, but more slowly.

2. What Is “Mac Running Out of Application Memory” Meaning?

The “your system has run out of application memory” error occurs when both RAM and virtual memory are full and the system can no longer allocate memory to open or running applications. As a result, macOS may freeze, close apps automatically or display alerts to quit apps to free up memory.

This particular error is caused by memory-hogging strict applications, memory leaks, or a hard drive lacking space for virtual memory. Quick resolution of this issue is a must if the user is serious about performance and preventing data loss.

Part 2. Why Does My Mac Keep Running Out of Application Memory?

Many users ask, “why is my computer running out of application memory?” Here are some of the most common reasons your Mac may keep displaying the "your system has run out of application memory" error:

• Too Many Apps Open: Running multiple apps at once can overload your RAM.
• Memory-Intensive Apps: Video editors, browsers with many tabs, or virtual machines use a lot of memory.
• Memory Leaks: Some poorly optimized apps fail to release memory properly, causing gradual memory drain over time.
• Low Disk Space: macOS uses available disk space for virtual memory (swap files). If your drive is full, the system can't manage memory efficiently.
• Large Files or Background Tasks: Transferring, rendering, or auto-syncing large files (e.g., via iCloud or Dropbox) can overload memory.
• Too Many Browser Tabs: Each open tab can consume a separate chunk of memory, especially with Chrome or Safari.
• Startup Items & Background Processes: Unnecessary login items and daemons can quietly consume memory after startup.

All these factors contribute to your Mac running out of application memory, resulting in performance issues and crashes.

Part 3. How to Clear Application Memory on Mac [Fastest Way]

If your Mac is slow and you see “your system has run out of application memory” frequently, it’s time to clean up the mess behind the scenes. Duplicate files and large files (especially those hidden big files) are space-hogging on Mac, which consume lots of RAM. Thus, you can consider to detect those files using a professional software - 4DDiG Duplicate File Deleter for Mac, better than Mac built-in settings, excel in identifying all kinds of duplicate and large files quickly and fully.

Apart from duplicate file removal, it also dedicates to finding and removing similar photos. Meanwhile, more additional features (like clean up Mac, removal for junk files, app caches, system and log files, etc.) is coming soon to give your Mac a new start and life. Just stay tune.

Key Features of 4DDiG for Mac:

• Cleans app caches, logs, and hidden files with AI precision
• Removes duplicate files and large unused files
• Reclaims storage space quickly and securely
• Enhances system performance and prevents memory errors
• Easy-to-use with a user-friendly interface
• Delete duplicates from Dropbox, OneDrive, and Google Drive

Here to Get More Space on Mac by Duplicate Removal with 4DDiG:

Follow these steps to quickly clean your system and fix "your computer has run out of application memory" errors:

• Download, install, and launch 4DDiG Duplicate File Deleter. On the main screen, choose "Duplicates" and click "Get Started".

  

• Select your "Local Drive" where you want to scan and remove duplicates or hidden large files on Mac. Upon it, click "Next".

  

• Then select the specific folders you want to scan for duplicate files, system junks, and large files on Mac. Also, clicking the lower Gear icon, you can adjust the scanning settings, for example, choose file types and skip specific files or folders. Later, click “Scan” to proceed.

  

• Wait the scanning process to finish. Afterward, you can select "Smart Remove" to delete duplicates automatically.

  

• You can also click "Review Duplicates" to preview and select files manually. Use "Auto Select" for the largest or oldest duplicates, then click "Remove" to delete them.

  

This is the fastest and safest method if you're wondering how to free up application memory Mac without technical complexity.

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Part 4. How to Fix “Your System Has Run Out of Application Memory” on Mac [Common Ways]

If your Mac constantly displays the dreaded "Your System Has Run Out of Application Memory" error, don't worry. This occurs when macOS has low free RAM and cannot handle app processes. Apart from the above way to free up memory, you can also give those common ways a shot. Here’s how to fix application memory on Mac step by step:

1. Check Activity Monitor & Close Unnecessary Apps

Sometimes, background applications or processes may be consuming more memory than necessary. Using the Activity Monitor allows you to identify and stop these memory hogs.

How to check:

• Open "Applications" > "Utilities" > "Activity Monitor".

• Click "View" in the top menu and choose "All Processes".

• Click the "Memory" tab.

• Look for applications with high memory usage.

• Select the app and click the (×) icon to quit the process.

  

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2. Disable Startup Programs

Startup programs run automatically every time you boot your Mac, consuming memory from the get-go.

Steps to disable startup items:

• Click the “Apple menu” in the top-left corner.

• Select “System Preferences”, then click “Users & Groups”.

  

• Click the "Login Items" tab to view the list of startup programs.

• Select the apps you don’t need and click the minus (-) button to remove them.

  

3. Shut Down & Reboot Your Mac

Restarting clears temporary files and memory leaks, giving your system a fresh start. This quick fix is especially useful after long sessions of heavy app usage.

Steps:

• Click the “Apple menu” in the top-left corner.

• Choose “Restart” or “Shut Down.”

• Once powered back on, observe your system's performance.

  

4. Disable Apple Intelligence

Some macOS background features related to machine learning or personalization might use memory unnecessarily. Disabling them may free up RAM. Disabling these can slightly reduce personalization but can help reclaim system resources.

Steps to disable:

• Open the "Apple menu" and select "System Settings".

• Click on "Apple Intelligence & Siri".

• Set the switch to the "off" position.

• Click "Turn Off Apple Intelligence" to confirm.

• Quit "System Settings".

  

5. Add More Space to Application Disk by Increasing Virtual Memory

macOS uses virtual memory (swap files) when physical RAM is full. Adjusting settings can help manage this better. macOS automatically manages virtual memory, but you can optimize disk space for swap files.

Here’s how to do that:

• Go to “Apple Menu” > “System Settings” > “General” > “Storage”.

• Enable “Optimize Storage” to free up space on your startup disk (swap files need free disk space).

• Ensure at least 10–20% of your SSD remains free (e.g., 20–50 GB on a 256 GB drive).

• Avoid completely filling your startup disk, as macOS needs space for swap files to function effectively.

Part 5. People Also Ask about Mac System Running Out of Application Memory

Q1: How to reduce application memory on Mac?

Use Activity Monitor to shut down memory-heavy apps. Clear caches and temporary files using 4DDiG Duplicate File Deleter. Restart your Mac regularly to clear memory and improve performance.

Q2: How do I clear application storage on my Mac?

To clear app storage on your Mac go to “System Settings”, open “General”, then “Storage” and delete unused files or apps. For deeper cleaning use tools like 4DDiG Duplicate File Deleter to remove caches, junk and duplicates.

Q3: Why is Safari using so much application memory?

Safari may use high memory due to too many open tabs, extensions, or JavaScript-heavy websites. Disable unused extensions and clear Safari cache regularly.

Q4: How much application memory is on a Mac?

Application memory is part of your Mac’s RAM and swap file system. Most Macs range from 8GB to 64GB of RAM, and virtual memory scales with available disk space. Monitoring this with Activity Monitor is essential.

Conclusion

When you see the message “Y our system has run out of application memory”, it means your Mac is struggling to keep up with its current workload. This can slow down performance or even cause apps to crash. You can give the above methods a shot according to your situations. Also, the most recommended solution is to use 4DDiG Duplicate File Deleter for Mac, which cleans unnecessary files, app caches and duplicates using AI. It’s the fastest way to regain memory space and speed up your Mac.