When should you restart your Mac? Signs it's time

Macs are built to run for weeks. Restarting is not a ritual you need every night, but it does clear problems that nothing else can.

Good reasons to restart

• A pending software update that needs a reboot. Security updates are the most important ones.
• Heavy swap use. When macOS runs out of free memory it pages to disk. A little is normal; gigabytes of it alongside a sluggish Mac suggests a restart will help.
• Long uptime and odd behaviour. Audio glitches, Bluetooth that won’t connect, Wi-Fi drops and apps that freeze often clear after a reboot.
• A runaway process that you can’t quit.

How to check

Uptime. In Terminal run uptime. It reports how long the Mac has been running.

Swap. Run sysctl vm.swapusage to see how much swap is in use.

Memory pressure. Open Activity Monitor → Memory and look at the pressure graph. Green is fine, yellow is worth watching, red means you’re short of memory.

Updates. System Settings → General → Software Update shows whether something is waiting.

What a restart will not do

It won’t make a slow, full disk fast, and it won’t “free up RAM” in a way you’ll notice for long. If the Mac is slow because storage is nearly full, start with freeing up storage.

Let the Mac tell you

Gardner’s Restart tile looks at uptime, swap and pending updates and gives one plain answer: restart now, or not worth it yet. It never restarts for you.