OpenSSL's 'speed' utility doesn't seem to have RSA-3072 on the list, but I suppo...

stock_toaster · on Oct 24, 2013

there is also a huge difference between newer and older versions of openssl.

  # default openssl install (osx mavericks)
  Doing 224 bit sign ecdsa's for 10s: 39077 224 bit ECDSA signs in 9.98s 
  Doing 224 bit verify ecdsa's for 10s: 8285 224 bit ECDSA verify in 9.98s
  OpenSSL 0.9.8y 5 Feb 2013

vs

  # homebrew openssl install
  Doing 224 bit sign ecdsa's for 10s: 61047 224 bit ECDSA signs in 9.99s 
  Doing 224 bit verify ecdsa's for 10s: 15609 224 bit ECDSA verify in 9.84s
  OpenSSL 1.0.1e 11 Feb 2013

Both on same mac laptop.