freefilesync SFTP slower than scp (single large file transfer)

[daviank]

I was trying to sync files with freefilesync SFTP (from PC to Android). I found it rather slow: between 150-700kB/s.

I also tried with scp and it is much faster, up to ~2MB/s

scp -v -P <port> -i <private-key-file> <source> <user@ipv4>:/

<source>               11%   44MB   1.7MB/s   03:21 ETA


This was with a keyfile, but the same happens with a password. It is by doing one transfer at a time.

To compare, I tried with a single file of ~500MB size.

Any reason for this?

[daviank]

I restarted the android app that acts as a ssh server as well as freefilesync.
After this, performance of freefilesync became equivalent to scp.