Why can Dropbox be super fast compared to FTP?

I'd like to know why technically Dropbox is much faster than FTP? What kind of technology does it use?

I'm not talking about diff files, I'm talking about transferring new files in both cases, Dropbox is much faster.

I mean it, very much faster, maybe 10 times faster than FTP for files I uploaded. I will experiment again for bigger files later.

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