macOS Running Slow

Common slow performance symptoms

• Apps take long to open or freeze.
• Spinning beachball appears frequently.
• Mac takes long to boot or shut down.
• Web browsing feels sluggish.
• System animations stutter or lag.

Step 1 – Check Activity Monitor

Activity Monitor shows which apps are using the most CPU, memory, or disk resources.

1. Open Activity Monitor (Applications → Utilities).
2. Check the CPU tab for apps using high percentages.
3. Check the Memory tab for apps using excessive RAM.
4. Quit or force‑quit apps that are stuck or consuming too much.

Step 2 – Check available storage

macOS slows down significantly when the disk is nearly full.

1. Go to Apple Menu → System Settings → General → Storage.
2. Check how much free space is available.
3. Delete large files, old downloads, or unused apps.
4. Empty the Trash to free space immediately.

Tip: Keep at least 10–20% of your disk free for best performance.

Step 3 – Remove unnecessary startup items

Too many apps launching at startup can slow your Mac down.

1. Open System Settings.
2. Go to General → Login Items.
3. Remove apps you don’t need starting automatically.

Step 4 – Check your web browser

Browsers can use huge amounts of memory, especially with many tabs or extensions.

• Close unused tabs.
• Disable or remove unnecessary extensions.
• Clear browsing data if the browser feels sluggish.

Step 5 – Spotlight indexing

If Spotlight is indexing your drive, your Mac may feel slow temporarily.

• Click the Spotlight icon — if it says “Indexing…”, wait for it to finish.
• Indexing usually completes within minutes to hours depending on disk size.

Step 6 – Install macOS updates

Updates often include performance improvements and bug fixes.

1. Go to System Settings → General → Software Update.
2. Install any available updates.

Step 7 – Reset SMC or NVRAM (Intel Macs only)

These resets can fix power, fan, and performance issues on Intel‑based Macs.

Reset NVRAM

1. Shut down the Mac.
2. Turn it on and immediately hold Option + Command + P + R.
3. Hold for about 20 seconds, then release.

Reset SMC

SMC reset steps vary by model:

• MacBooks with T2 chip: Shut down → hold Control + Option + Shift for 7 seconds → keep holding and press power for 7 more seconds → release → wait → turn on.
• Older MacBooks: Shut down → hold Shift + Control + Option + power for 10 seconds → release → turn on.
• iMac/Mac mini/Mac Pro: Shut down → unplug for 15 seconds → plug in → wait 5 seconds → turn on.

Note: Apple silicon Macs do not use SMC/NVRAM resets.

Step 8 – Run Disk Utility First Aid

Disk errors can slow down macOS significantly.

1. Restart your Mac into Recovery Mode.
2. Open Disk Utility.
3. Select your startup disk.
4. Click First Aid and let it complete.

Step 9 – Reinstall macOS

If system files are damaged, reinstalling macOS can restore performance without erasing your data.

1. Restart into Recovery Mode.
2. Select Reinstall macOS.
3. Follow the on‑screen steps.

When it might be hardware

• Mac overheats frequently.
• Fans run at full speed constantly.
• System freezes even after reinstalling macOS.
• Battery is swollen or failing (MacBooks).
• SSD is failing or extremely slow.