MacDebug

Verified for macOS Tahoe 26.2

Fix Guide: Tahoe "backgroundtasks" High CPU

Symptom: Your Mac fans are spinning loudly, and Activity Monitor shows a process named "backgroundtasks" using 100%+ CPU on macOS Tahoe.

Why this happens

The backgroundtasks daemon in Tahoe is responsible for indexing new AI features and system maintenance. It can get stuck in a loop if it encounters a corrupted file in the temporary system folders.

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Fix 1: Clear the Background Task Queue

  1. Open Terminal.
  2. Run the following command to clear the pending task metadata:
sudo rm -rf /var/folders/*/*/*/com.apple.backgroundtasks
  1. Restart your Mac immediately.

Fix 2: Reset the Dispatch Queue

If the CPU usage returns, reset the job scheduler:

  1. In Terminal, type:
sudo launchctl kickstart -k system/com.apple.backgroundtasks
  1. Monitor Activity Monitor for 5 minutes to ensure the process settles down.

Recommended Tool: iStat Menus

To keep an eye on hidden processes like this and get alerts before your Mac overheats, use iStat Menus. it provides detailed CPU per-core breakdowns and fan control.