Fix Guide: Finder Slow or Lagging on macOS Tahoe 26.2
Symptom: Finder takes several seconds to open folders, the "spinning beachball" appears when right-clicking, or file previews (QuickLook) are slow.
In Tahoe 26.2, Finder lag is often caused by a corrupt "Spotlight" index or a hang in the iCloud "Bird" process trying to sync metadata.
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Fix 1: Relaunch Finder and Clear State
Force-closing Finder is the quickest way to clear a temporary hang.
- Press Option + Command + Escape.
- Select Finder and click Relaunch.
- If it remains slow, clear the Finder preference file:
rm ~/Library/Preferences/com.apple.finder.plist
Fix 2: Reindex the Spotlight Database
If Finder is struggling to display file sizes or icons, the index is likely corrupt.
- Open Terminal.
- Run:
sudo mdutil -E /
- Your Mac will be slow for 15-30 minutes while it rebuilds the index, but Finder speed should improve once complete.
Fix 3: Disable QuickLook Previews for Large Folders
QuickLook can hang if it tries to generate a preview for a corrupt video or large PDF.
- Open any Finder window.
- Go to View > Show View Options.
- Uncheck "Show icon preview" and "Show preview column."