[benoitc]

Like said david in comments of this post, gunicorn is specifically designed to run behind a proxy like nginx. You should use 2x or 2x+1 numbers of cores.

Also limiting its use to one worker is constraining any possibilities for concurrency in its responses. (grainbows built over gunicorn and using gevent or eventlet is better for that).

Some other servers in the tests have same kind of specifications.