Scanning and comparing processes as the whole go by the name of TFS (Twin Files Sweeper).
The progress of both scanning and comparing processes is reflected in tree progress bar. One of the bars reflects the entire process while the other two bars refer to each separate process.

After you started TFS, all the changes in the statistics are displayed in the table that contains eleven categories. The following categories are available:

1. Total files - Total number of all files.
2. Total size - Total size of all files.
3. Current file - Ordinal number of file being compared (in progressive order).
4. Suspicious files - Number of files that may be identical to one or more files.
5. Current Suspicious file - Ordinal number of current "Suspicious" file.
6. Dupes found - Number of that fully qualify as duplicates.
7. Elapsed Time - How much time the process has taken so far.
8. Disk read - Amount of information that has been read from the disk.
9. Average disk read speed - Average reading speed during the whole period of scanning.
10. Disk read speed - Current reading speed.
11. File sorting speed - how many files can be sorted in a minute (may depend on what other programs are currently running, system resources, number of total files, etc.)

Next step: 2.1. Comparing and selecting by hand