The duplicate scanner is designed to add minimal time to the regular scan. The two-pass approach (size grouping first, then hashing only matching files) means it avoids reading the full contents of most files.
On a typical computer with an SSD, the duplicate scan adds a few seconds to the total scan time. On computers with a large number of files or a traditional hard drive, it may take longer -- up to 30 seconds in some cases.
During the duplicate scan, you will see progress text: "Scanning for duplicates: checked 12,847 files..." so you know the app is working.
The scanner caches file hashes between sessions, so repeat scans are faster -- only new or modified files need to be re-hashed.
If you prefer not to scan for duplicates, you can uncheck "Duplicate Files" in the sidebar to skip it entirely.
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