HTTP Upload/Download speed is slow

[moi90]

When downloading exported projects over HTTP, download speed is never over 500kiB/s for me. (I don't have measurements for upload right now.)

If, I use FTP, however, it is drastically faster. Since FTP will not be available anymore in the foreseeable future, it would be good to investigate and optimize HTTP upload/download speed.

Last year, @jiho talked about more efficient HTTP-based file management that was about to being released. But it doesn't feel like the speed changed in any significant way.

I think it might be worthwhile to have the file transfer handled exclusively by the web server and not in Python, to obtain maximum bandwidth.