Running slowMediummac is running slowly
What this error means
This means your Mac is responding more slowly than usual, with apps taking longer to open, scrolling feeling laggy, or the whole system pausing for a moment. It often shows up after a long session, when many apps are open, or when your Mac is low on memory, storage, or system resources.
Common causes
- 1Too many apps or browser tabs are open at once
- 2Low free disk space is making macOS work harder
- 3A background process is using a lot of CPU or memory
- 4macOS or an app needs an update
- 5A startup item or login item is slowing the Mac down
How to fix it
- Close anything you are not using. Quit large apps, especially video editors, games, and browsers with many tabs open. If the Mac feels frozen, wait a minute before forcing anything closed.
- Restart your Mac. A restart clears temporary memory use and can stop one-off processes that are causing the slowdown.
- Check disk space. Open Apple menu > System Settings > General > Storage. If your storage is nearly full, remove unneeded files, empty the Trash, and move large items you do not need right now to external storage or cloud storage.
- Look for a heavy process. Open Activity Monitor and sort by CPU or Memory. If one app is consistently using a very large amount, quit it and reopen it. If it keeps happening, that app may need an update or reinstall.
- Install updates. Update macOS and your apps, since performance fixes are often included in updates. If the slowdown started after an update, give the Mac a few minutes after startup so background tasks can finish.
- Reduce what starts automatically. Go to System Settings > General > Login Items and remove anything you do not need every time you sign in. Fewer startup items can make the Mac feel faster.
- Run a Quickfix scan if the problem continues. This can help check for common performance issues and guide you to the next best step without changing anything risky.
Recommended fixes
Run a Quickfix scan
- Open Quickfix AI and click Start scan.
- Choose the Quick or Advanced profile and let the scan finish.
- Review the highlighted issues and apply the recommended fixes.
Restart your device
A restart clears temporary state that often causes transient errors.
- Save your work and close open apps.
- Restart the device from the power menu.
- Reproduce the issue to check whether it persists.
Install macOS updates
- Open System Settings > General > Software Update.
- Install any available updates.
- Restart if prompted.
Close resource-heavy apps
- On Windows open Task Manager (Ctrl+Shift+Esc); on macOS open Activity Monitor.
- Sort by CPU or memory usage.
- Quit apps you don't need that are using excessive resources.
Free up disk space
- Empty the Recycle Bin / Trash.
- Remove large files and apps you no longer use.
- Aim to keep at least 10% of the drive free.
When to seek help
Get help if the Mac is still slow after a restart, updates, and clearing enough storage, or if the slowdown is getting worse every day. You should also seek professional support if fans are constantly loud, the Mac overheats, apps keep quitting unexpectedly, or the slowdown appears together with error messages, crashes, or repeated restarts.
Need more help?
Run a free diagnostic scan to identify and fix issues automatically.
Download Quickfix AI