Jan Ehrhardt wrote:

>> 33.153s vs 5.4s for a 10 MByte file.
>
> Did you time how long Filezilla takes for the same action? Filezilla
> squeezes quite a lot over sftp-connections...

11.4 sec!!

 From the "About" box:
   Version: 3.31.0
   Build information:
     Compiled for: x86_64-w64-mingw32
     Compiled with: x86_64-w64-mingw32-gcc (GCC) 6.3.0 20170516
     Compiler flags: -g -O2 -Wall
     GnuTLS: 3.5.18
     CPU features: sse sse2 sse3 ssse3 sse4.1 sse4.2 avx avx2 aes pclmulqdq rdrnd bmi2 bmi2

I must be using the wrong compiler and SSL-lib :-)
But, it's certainly possible to make SFTP faster.

-- 
--gv
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