What version of OpenSSL was used on the test machine? That would greatly effect stunnel's performance. See here: http://vincent.bernat.im/en/blog/2011-ssl-bench

What version of OpenSSL was used on the test machine? That would greatly effect stunnel's performance. See here: http://vincent.bernat.im/en/blog/2011-ssl-benchmark-round2.html http://vincent.bernat.im/en/blog/2011-ssl-benchmark-round2.h...