What exactly are you referring to? Upload speed? That's not the issue. Dropbox is the best at crawling a very complex directory structure with millions of file

What exactly are you referring to? Upload speed? That's not the issue. Dropbox is the best at crawling a very complex directory structure with millions of files and diffing it efficiently with the server and other clients, and then transferring all the individual changes. Nothing else comes close. And their write-ups show the work involved: https://dropbox.tech/infrastructure/rewriting-the-heart-of-our-sync-engine https://dropbox.tech/infrastructure/rewriting-the-heart-of-o... https://dropbox.tech/infrastructure/-testing-our-new-sync-engine https://dropbox.tech/infrastructure/-testing-our-new-sync-en...