slow https performance compared to http

[gigihc11]

Just to help those not knowing about -k option:
-k     Enable the HTTP KeepAlive feature, i.e., perform multiple requests
within one HTTP session. Default is no KeepAlive

I'll do it but I guess the test will no longer be so relevant because I want
to simulate different users. 
Anyway, the question is in fact: is this http/https ratio normal? 
If is it than I'll live with it, but if not then I might do something wrong.

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,270898,270906#msg-270906