A slow Mac costs you time every day. Windows take a long time to open, the spinning rainbow wheel shows up, and simple tasks like opening a spreadsheet feel like a chore. The good news is that most slow Macs can be sped up without spending anything.
This guide explains the usual reasons a Mac slows down. Then it walks through ten fixes, from quickest to most involved. At the end, we cover when a new SSD or a new Mac is the better choice.
A quick note: Apple changes menu names and layouts as macOS updates. The steps below are described in general terms. If a menu looks different on your Mac, check the current settings or search Apple’s support site for your macOS version.
Why is my Mac slow? The common causes
Most slowdowns come from a short list of problems:
- Too many things running at once. Open apps, dozens of browser tabs, and background programs all compete for memory and processor power.
- Too many startup items. Apps that launch when you log in slow down your first few minutes every day.
- A nearly full drive. A Mac needs free space to work. When the drive is almost full, everything gets sluggish.
- Not enough memory (RAM) for the work you do. Newer apps and bigger files need more than older Macs can give.
- Old software. Outdated macOS or apps can run poorly or clash with each other.
- Unwanted extras. Adware, extra browser extensions, and leftover apps can run in the background.
- Heat. A Mac that runs hot slows itself down to protect its parts.
- Aging hardware. Older Macs with a spinning hard drive are much slower than ones with flash storage.
Knowing the likely cause helps you pick the right fix. Start at the top of the list below and work down.
10 fixes for a slow Mac, in order
1. Restart your Mac
It sounds too simple, but it works more often than people expect. If your Mac has been running for weeks without a restart, background processes can pile up. Save your work, restart, and see if things improve.
2. Find the culprit in Activity Monitor
Activity Monitor is a built-in app that shows what your Mac is working on. You can find it by searching for it with Spotlight.
- Open Activity Monitor.
- Click the CPU tab and then click the CPU column to sort by the busiest items.
- Click the Memory tab and look at the memory pressure graph at the bottom. Green is healthy. Yellow or red means your Mac is short on memory.
- If one app is using a large share and you do not need it, select it and quit it.
If you see the same app hogging resources again and again, update it or look for a replacement.
3. Close apps and browser tabs you are not using
Every open app and browser tab uses some memory. Quit apps you are done with, not just close their windows. Then close extra browser tabs. Browsers are often the biggest memory users on an office Mac.
While you are there, look at your browser extensions. Remove any you do not recognize or no longer use.
4. Clean up your login items
Login items are apps that start on their own when you log in. Too many of them make startup slow and keep using memory all day.
On recent versions of macOS, look in System Settings under General, then Login Items. Older versions have a Login Items list under Users & Groups. Remove anything you do not need running all the time. You can still open those apps yourself when you need them.
5. Free up storage space
A very full drive is one of the most common reasons a Mac feels slow. Open your Mac’s storage settings (look for Storage in System Settings, or “About This Mac” on older versions) to see what is taking up room.
Then try these steps:
- Empty the Trash.
- Delete old downloads and installer files.
- Remove apps you no longer use.
- Move large photo, video, and project files to an external drive or a cloud storage service your business already uses.
As a general rule, try to keep a healthy amount of free space. If you do heavy work with video, design, or large files, you need even more room.
6. Update macOS and your apps
Updates often fix bugs that cause slowdowns. Check for updates in System Settings or the App Store, and update your main apps too.
One tip: right after a big macOS update, a Mac can feel slow for a while because it is doing background work, like reorganizing files for search. Give it some time, plug it in, and let it finish before you decide something is wrong.
If your Mac can no longer install current updates, that is a sign it is getting old. We cover that further down.
7. Remove unwanted apps and extras
Look through your Applications folder for programs you do not use. Pay special attention to anything you do not remember installing, such as odd toolbars, “cleaner” programs, or pop-up generators. These can slow your Mac and may be unwanted software.
If you think your Mac has adware or something worse, a proper scan is the next step. For offices with several computers, managed IT services arranged through our IT partners can handle this kind of monitoring so you are not chasing problems one Mac at a time.
8. Check for heat and battery problems
A hot Mac slows itself down. Make sure the vents are not blocked. Do not use a laptop on a soft surface like a bed or couch cushion, and keep dust out of the vents. If the fan runs loudly all the time, even with few apps open, there may be a hardware problem or a runaway process (look back at Activity Monitor).
On a MacBook, an old battery can also cause performance issues. Check the battery health in your settings. If it says service is recommended, have it looked at.
9. Try Safe Mode
Safe Mode starts your Mac with only the basics and runs some checks on your startup drive. It also clears some temporary files, called caches. If your Mac runs well in Safe Mode, the problem is likely a login item, extension, or app.
The way you start Safe Mode is different on Apple silicon Macs and older Intel Macs. Check Apple’s support page for the exact steps for your model. Once you are done, restart normally.
10. Back up, then reinstall macOS
If nothing else has helped, a clean reinstall of macOS can clear out deep software problems. This is the biggest step, so do it last.
- Back up your files first. Use Time Machine or another backup you trust, and make sure you can open the backup.
- Follow Apple’s instructions to reinstall macOS or erase and set up the Mac again.
- Add back only the apps you truly need.
If your Mac is fast after a clean start and slows down again once you reinstall everything, one of your apps is probably the cause.
When an SSD is the better spend
An SSD (solid-state drive) stores data on flash memory instead of a spinning disk. If you have an older Mac that still uses a traditional hard drive, switching to an SSD can make a very noticeable difference. Startup, app launches, and file opening all get faster.
To check what you have, open “About This Mac” and look at the storage details, or check your model year on Apple’s support site. Then keep these points in mind:
- Older Macs with a hard drive or a hybrid drive are good candidates. In some models, the drive can be replaced.
- Newer Macs usually have storage built in that cannot be upgraded later. The same is often true of memory. For these, an external SSD can help with extra file storage, but it will not change the speed of the Mac itself.
- Have a professional do it if you are unsure. Opening a Mac can be tricky, and a mistake can damage it.
Before you buy anything, make sure the Mac is worth the investment. Putting a new drive in a Mac that is already at the end of its support life may only delay the problem.
When a new Mac makes more sense
Sometimes the honest answer is that the Mac has done its job and it is time to replace it. Consider a new Mac if:
- It can no longer install current macOS updates, which also affects security.
- It stays slow after you have tried the fixes above, including a clean reinstall.
- Your normal work, like larger files or heavier apps, has outgrown its memory and processor, and it cannot be upgraded.
- Repair costs are getting close to the value of a replacement.
- The battery, screen, or other parts keep failing.
For a business, also think about lost time. If an employee waits on a slow computer every day, that adds up. Replacing the machine can be the cheaper choice over time.
Planning replacements for a whole team is easier when you spread them out and keep a simple list of how old each computer is. If you run an office with several kinds of equipment, our more how-to guides cover other everyday problems too.
The short version
Start with a restart, check Activity Monitor, close what you do not need, trim your login items, and free up space. Update your software, remove unwanted apps, watch for heat, and try Safe Mode. If that does not work, back up and reinstall. After that, decide between an SSD or a new Mac based on how old your machine is and whether it can still be upgraded.
Frequently asked questions
Why is my Mac slow all of a sudden?
A sudden slowdown often comes from a runaway app, a nearly full drive, or a recent macOS update still finishing background work. Restart first, then open Activity Monitor to see what is using the most processor and memory. Quit that app, and make sure your drive has free space.
Will adding more RAM make my Mac faster?
It can, but only if your Mac is short on memory and the RAM can be upgraded. Many newer Macs have memory built in, so it cannot be changed later. Check Activity Monitor's memory pressure graph. If it stays yellow or red during normal work, memory is likely the limit.
Does upgrading to an SSD really speed up a Mac?
If your Mac uses an older spinning hard drive, an SSD usually makes startup and app loading much faster. If your Mac already has flash storage, a new drive will not help much. Check your storage type in About This Mac before buying anything.
How do I know if my Mac is too old to fix?
Signs include being unable to install current macOS updates, staying slow after a clean reinstall, and storage or memory that cannot be upgraded. Frequent hardware failures are another clue. If repairs approach the cost of a replacement, a new Mac is usually the better choice.