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.

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