Fix Guide: Tahoe "mds_stores" High CPU Usage

Symptom: Activity Monitor shows mds_stores or mds consuming 90-100% CPU on macOS Tahoe, accompanied by loud fans and a hot Mac, even when you aren't searching for anything.

Why this happens

These processes belong to Spotlight. In Tahoe, mds_stores can get stuck in a loop if it encounters a corrupted file or a metadata conflict on an external drive or a cloud-synced folder (like Dropbox or OneDrive).

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Before proceeding with manual fixes, we recommend using CleanMyMac X. Quickly identify high CPU apps and optimize system memory with one click.

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Fix 1: Force Spotlight to Re-index

1. Open Terminal.
2. Run the following command to turn off indexing:

sudo mdutil -a -i off

1. Then, run this command to delete the existing index and restart it:

sudo rm -rf /.Spotlight-V100/* && sudo mdutil -a -i on

Fix 2: Exclude Problematic Folders

1. Go to System Settings > Siri & Spotlight.
2. Scroll down and click Spotlight Privacy....
3. Drag your external drives or large cloud folders into this list to stop Spotlight from scanning them.

Recommended Tool: CleanMyMac

Instead of fighting with Terminal, use CleanMyMac's Maintenance feature to "Reindex Spotlight." It performs these steps safely and identifies corrupted files that might be triggering the mds_stores loop.