Because you have the TLS handshake that has to be done which is CPU bound

Try change things like ssl_ciphers (to something faster), and use
ssl_session_cache/
--
Best Regards,
Lucas Rolff


gigihc11 wrote:
> Hi, I have:
> nginx 1.11.3
> Ubuntu 16.04.1 LTS
> openssl 1.0.2g-1ubuntu4.5 amd64
> libssl1.0.0:amd64 1.0.2g-1ubuntu4.5
> weak CPU: N3150
> 16 GB RAM
>
> with this test-setup:
> open_file_cache max=1000 inactive=360s;
> open_file_cache_valid 30s;
>
> I test on running ab command on the same host as nginx is.
> For a 1.6KB text file I get 4600 req/s with http and 550 req/sec with https.
> I get the same using or not gzip encoding.
>
> Why is this huge performance difference?
>
> Posted at Nginx Forum: https://forum.nginx.org/read.php?2,270898,270898#msg-270898
>
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