TLS/SSL slow down HTTP-traffic with a factor 57!

Recently I wrote about the impact of SSH-tunnels on HTTP-traffic. So I discussed with a collegue the results and he was wondering in the impact of TLS/SSL on HTTP-traffic. And I found out, that TLS/SSL slows down the communication about a factor 57!

Again, I did perform the test with and without keep-alive feature. I did the next tests:

1. 10.000 requests with 200 concurrent connections without HTTP-keepalive to port 80 on the server
2. 10.000 requests with 200 concurrent connections with HTTP-keepalive port 80 on the server
3. 10.000 requests with 200 concurrent connections without HTTP-keepalive server using TLSv1/SSLv3,DHE-RSA-AES256-SHA,1024,256.
4. 10.000 requests with 200 concurrent connections with HTTP-keepalive server using TLSv1/SSLv3,DHE-RSA-AES256-SHA,1024,256.

Phase	Short description	Requests/sec	Avg time in ms per request
1	HTTP	7178.82	0.139
2	HTTP + Keepalive	7112.98	0.141
3	HTTPS	124.53	8.030
4	HTTPS + Keepalive	124.44	8.036