FreeFileSync Forum

The use of checksums [...] would not speed up the FFS comparison.

Correct, but performance with checksums is much worse: While FFS is comparing file content it breaks on the first byte difference found. Using checksums on the other hand would always require reading the full file content.


I ...

On what storage type were the files stored?
I tried between mechanical HDD and microSD 10GB each side (200+ files in each side) and it took almost 3 hours. Also depend of where the difference are, for example if each file have the same bytes except the last one it need a lot more time to compare ...

I join in asking to add an option in the settings to speed up the comparison using the checksum method (perhaps in the donations package along with the other options for performance?).
Open source projects using this approach are very fast:
https://github.com/arsenetar/dupeguru/
https://github.com ...