What "process memory" means and why it fills up
process memory is the working space your Mac gives to each program while it runs. When you open an app, it loads parts of itself into this memory so it can work fast. The more apps you have open at once, and the longer they stay open, the more memory gets used. When memory runs low, your Mac slows down because it has to work harder to keep everything running.
Memory is different from storage. Storage is the hard drive space where your files and programs live permanently. Memory is temporary — it clears when you restart your Mac. You can have plenty of storage space but still run out of memory if too many apps are competing for it at the same time.
On newer Macs with Apple silicon chips (M1, M2, M3 and later), memory management is more efficient than on older Intel-based Macs, but the problem still happens. The most common sign is that your Mac becomes sluggish, apps take longer to open, or you see a spinning wheel that won't stop.
Key Takeaways
- Close apps you are not actively using, especially web browsers with many tabs open, since they consume the most memory on most Macs.
- Check Activity Monitor (in Applications > Utilities) to see which specific apps are using the most memory right now.
- Restart your Mac to clear all memory and return it to a clean state, which is the fastest way to recover memory when slowness becomes noticeable.
- Reduce the number of browser tabs open and disable browser extensions you do not use, since these are the most common culprits in everyday memory problems.
- Upgrade your Mac's physical memory (RAM) if you regularly run memory-heavy work like video editing, coding, or running virtual machines.
Check which apps are using the most memory
Before you close anything, look at what is actually consuming memory. Open Activity Monitor by going to Applications > Utilities > Activity Monitor. Click the Memory tab at the top. You will see a list of every running process, sorted by how much memory each one uses.
The apps at the top of the list are your memory hogs. On most Macs, you will see Google Chrome, Safari, or Firefox near the top — web browsers use a lot of memory, especially when you have many tabs open. You might also see Slack, Microsoft Teams, or other communication apps, which stay active in the background. Mail, Photos, and Finder can also use significant memory depending on what you are doing.
Leave Activity Monitor open while you work through the next steps. You can watch the memory numbers change as you close apps and tabs, which helps you see what actually makes a difference.
Close apps and browser tabs you are not using
The simplest way to free up memory is to close programs you have open but are not actively using. If you have Slack open but are not checking it, close it. If you have Mail running in the background, close it. Each closed app when ready returns its memory to the system.
Browser tabs are especially important. Each open tab in Chrome, Safari, or Firefox uses memory. If you have 20 tabs open across two browser windows, close the ones you are not reading right now. You can bookmark a page if you want to come back to it later. Closing 10 tabs can free up 500 MB to 1 GB of memory depending on what those pages contain.
If you use multiple browsers at once (Chrome and Safari, for example), close one of them. Running two browsers simultaneously doubles your memory load. Pick one as your main browser and close the other.
Disable or remove browser extensions
Browser extensions are small programs that run inside your web browser. Each one uses memory, and some use more than others. If you have many extensions installed, they add up quickly.
In Chrome, go to Settings > Extensions. Look at the list and remove any extension you do not actively use. In Safari, go to Safari > Settings > Extensions. Disable extensions by unchecking the box next to them, or remove them entirely by clicking the Uninstall button.
Pay special attention to extensions that run all the time, like password managers, ad blockers, and VPN tools. These are useful, but if you have multiple ones doing similar jobs, remove the duplicates. For example, if you have both uBlock Origin and Adblock Plus, you only need one.
Restart your Mac
Restarting your Mac clears all memory and closes all running apps at once. This is the fastest and most reliable way to recover memory when your Mac has been running for days or weeks. Memory leaks — situations where apps do not fully release memory even after you close them — are fixed by a restart.
Go to the Apple menu in the top left corner and select Restart. Your Mac will close all apps, shut down, and start fresh. When it boots back up, all memory is available again. This usually takes two to five minutes depending on your Mac model.
If you want to avoid restarting frequently, close apps you are done with instead of leaving them open all day. A Mac that has been running for a week will have accumulated more memory problems than one restarted every few days.
Reduce what runs in the background
Some apps are set to launch automatically when you start your Mac and run in the background even when you are not using them. These consume memory all day. Go to System Settings > General > Login Items. You will see a list of apps that start automatically. Remove any app you do not need running at startup.
Also check System Settings > General > Login Items > Allow in the Dock. Apps listed here are running in the background. If you see apps you rarely use, remove them from this list.
Communication apps like Slack, Teams, and Discord are common offenders. If you do not need to receive notifications from them while you work, close them and open them only when you want to check messages.
Consider upgrading your Mac's RAM if the problem is constant
If you have closed apps, disabled extensions, and restarted your Mac, but slowness returns within hours, your Mac may not have enough physical memory for the work you do. This is especially true if you regularly run memory-intensive programs like video editing software, virtual machines, or development tools.
Check how much RAM your Mac has by going to Apple menu > About This Mac. Look at the Memory line. Most Macs come with 8 GB or 16 GB. If you have 8 GB and regularly run out of memory, upgrading to 16 GB or 24 GB will solve the problem permanently.
On newer Macs with Apple silicon (M1 and later), RAM is soldered to the motherboard and cannot be upgraded after purchase. If you are buying a new Mac and plan to do memory-heavy work, choose a higher RAM configuration from the start. On older Intel-based Macs, RAM can sometimes be upgraded by a technician, though this is becoming less common.
Frequently Asked Questions
Is it bad to leave my Mac running all the time?
Leaving your Mac on continuously allows memory leaks to build up over time, which causes slowness. Restarting once a week or whenever you notice slowness helps prevent this. Modern Macs are designed to handle frequent restarts without wear.
Why does my Mac slow down even after I close apps?
Apps sometimes do not fully release memory even after you close them. This is called a memory leak. Restarting your Mac clears these leaks. If slowness returns quickly after a restart, you may have a specific app that leaks memory — check Activity Monitor to identify it.
Does clearing the cache or trash help with memory?
Clearing your trash and cache frees up storage space on your hard drive, not memory. These actions do not help with slowness caused by too many open apps. Memory is separate from storage, so they do not affect each other.
Will closing Safari tabs actually make my Mac faster?
Yes. Each open tab uses memory, and closing tabs returns that memory to the system when ready. If you have 15 tabs open, closing them can free up 500 MB to 1 GB depending on the websites. You will notice the difference if your Mac was running slowly.
What is the difference between memory and storage on a Mac?
Memory (RAM) is temporary working space that clears when you restart. Storage is permanent space on your hard drive where files live. A Mac can have plenty of storage but run out of memory if too many apps are open. They are separate systems.