Laptop BitLocker failing on drive with thumbnail cache fragmentation
4.5
Fragmented thumbnail databases (thumbcache_*.db) cause Explorer lag during encryption.
Symptoms
- Slow folder opening
- Explorer.exe hang
- BitLocker setup lag
Possible Causes
- Large image/video collections
- Cache corruption
Step-by-Step Fix
1
Clear Thumbnail Cache
Use Disk Cleanup and select "Thumbnails".
2
Delete Cache Files
Manually delete files in AppDataLocalMicrosoftWindowsExplorer.
3
Disable Thumbnails
Temporarily switch to "Always show icons, never thumbnails" in Folder Options.
When to See a Technician
Thumbnail caches are frequently written to; clearing them fixes many Explorer-related performance issues.
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