Why is my Mac running slow?
A slow Mac is usually fixable. Here are the most common reasons, the order to check them, and what to try before you bring it in.
The short version
Almost every slow Mac falls into one of five buckets: storage is too full, too many things are starting up at login, an aging hard drive needs to become an SSD, software needs an update, or a specific app is misbehaving. Working through them in that order solves most cases.
1. Storage is nearly full
macOS needs free space to run well. If your drive is close to full, performance drops sharply because the system cannot create temporary files, swap memory, or take Time Machine snapshots. Aim for at least 10 percent free at all times.
- Open Apple menu, About this Mac, Storage to see what is using space.
- Move photos and videos to an external drive or iCloud.
- Empty the Trash and the Downloads folder.
- Uninstall apps you do not use anymore.
2. Too many startup and background apps
Apps that launch at login and run in the background eat memory and slow boot times. Cloud sync clients (Dropbox, Google Drive), chat apps, and update agents are common culprits. Review them in System Settings, General, Login Items.
3. An aging hard drive
Older Macs with a spinning hard drive feel dramatically faster after an SSD upgrade. This single change is the biggest performance bump for any Mac from before about 2013. If your Mac takes more than 30 seconds to boot or you hear the drive working when apps are loading, this is probably your fix.
4. Software that needs updating
Out-of-date apps and macOS versions cause slowdowns and instability. Install pending updates from System Settings, but back up first since major updates occasionally introduce their own issues.
5. A specific app is misbehaving
Open Activity Monitor (Applications, Utilities). Sort by CPU. If one process is using 80 percent or more constantly, that is your bottleneck. Quit it and see if things improve. Browser tabs are notorious for this.
Other things worth trying
- Restart the Mac if it has been a while. Many small issues clear up on a fresh boot.
- Clear browser cache and close excess tabs.
- Check that no large downloads or backups are running.
- On older Macs, a SMC reset (Intel) or shutting down for 30 seconds (Apple silicon) can help.
When to bring it in
If you have worked through the list and your Mac is still slow, the next steps usually need shop tools and time. Storage cleanup, login item review, app reinstalls, and SSD upgrades are the most common things we do for slow Macs. Most take a few hours and start at $99 plus parts.
Common questions
Will an SSD upgrade speed up an old Mac?
Almost always, yes. On any Mac with a spinning hard drive (pre-2012 iMacs, older MacBook Pros), an SSD upgrade makes the machine feel two to three times faster. On Macs that already have an SSD, the speed gain is smaller but freeing up storage and reinstalling macOS can still help noticeably.
How much free space should I keep on my Mac?
At least 10 to 15 percent of the drive. macOS uses free space for swap files, caches, and Time Machine snapshots. If you are under that, performance drops fast.
Is it worth upgrading an old Mac or just buying refurbished?
Depends on the Mac and the upgrade. A 2015-2019 MacBook Pro with an SSD upgrade is a solid machine for years more. A 2010 iMac, less so. We will give you a straight answer when you bring it in.
Why is my new M1 or M2 Mac slow?
Apple silicon Macs are rarely slow due to hardware. The usual cause is a runaway app, a Spotlight indexing cycle, low storage, or background sync. We can find what is hogging the system and fix it.
Does cleaning out apps actually help?
Yes for storage, yes for background processes, less so for raw speed. Most apps you do not use sit quietly until you launch them. The win is in reclaiming space and trimming the login items list.
Want us to take a look?
Bring it in to 196 College St, or send a few details for a quote.