Mac running slow overall

Symptoms

• Everything takes longer to open than it used to
• Switching between apps feels delayed
• Fan spins up even during light use
• Mac feels especially slow with many browser tabs or apps open

Likely causes

• CommonToo many apps or browser tabs open at onceEach one uses memory and CPU even when not actively in use.
• CommonStartup disk nearly fullmacOS needs free space to manage memory and background tasks efficiently.
• CommonToo many login items launching automaticallyThese compete for resources right from startup, even if you never open them directly.
• PossibleAn older Mac with a spinning hard drive instead of an SSDOlder Macs are far slower than SSD-equipped models at loading apps and files.
• PossibleBackground processes like Spotlight indexing or Time Machine backups runningThese are temporary but can make the Mac feel slow while active.

What to do

1. Restart the Mac, which clears out temporary memory buildup from days of continuous use.
2. Open Activity Monitor (Applications > Utilities) and sort by CPU and Memory to see what's using the most resources.
3. Close apps and browser tabs you're not actively using.
4. Check About This Mac > Storage and free up space if it's nearly full.
5. Go to System Settings > General > Login Items and remove anything you don't need launching automatically.
6. Let any active Spotlight indexing or Time Machine backup finish before judging overall speed.
7. Check if your Mac has a spinning hard drive (older models) versus an SSD in About This Mac > Storage or System Report.
8. If the Mac is several years old with a mechanical drive, an SSD upgrade (where supported) offers a dramatic speed improvement.

Tools and parts

• None required

When to call a pro

If the Mac stays slow after cleanup and it's an older model with an upgradeable drive, an Apple-authorized shop can evaluate and perform an SSD upgrade.

Safety