Code:
[External compressor:xzstd]
header = 0
packcmd = xtool precomp -mzstd -t100p-1 - - <stdin> <stdout>
unpackcmd = xtool decode -t100p-1 - - <stdin> <stdout>
With this setting, the zstd compression is much slower compared with zlib

.
In my tests > zstd use aprox 150 mb memory / zlib use aprox 450 mb memory
With the new libzstd, what is an optimal setting for use ?