I once had a directory on OpenZFS with more than a billion files, and after cleaning it up with only handful of folders remaining, running ls in it still took a

I once had a directory on OpenZFS with more than a billion files, and after cleaning it up with only handful of folders remaining, running ls in it still took a few seconds. I guess some large but almost empty tree structure remained. https://0kalmi.blogspot.com/2020/02/quick-moving-of-billion-files-from.html https://0kalmi.blogspot.com/2020/02/quick-moving-of-billion-...