Slow hardlinking

[mtbc]

I tried hardlink 0.3 RC2; I read that performance issues on large data sets caused it to be rewritten in C. It reduced the used space on my backup volume from 484GB to 325GB but took nearly 1½ days to do so. Considering that it then took under 4⅓ hours to rsync -aH that 325GB onto an empty volume, I wonder what on Earth hardlink was up to for much of that time, it's not like deduplication requires cryptographic-strength hashing.