Nginx setup advice

Honestly I did a search but so many results came up saying different things I figured a new topic wouldn't be that bad.

I've muddled through my first drupal setup using Nginx but I don't think it's set right it works but it is a bit slow and some things that don't work on the site point to Nginx being the problem.

So I want advice for setting up Nginx.

All comments welcome as always :) below is what I am currently using for a site I plan to set up 4 more sites this month so I could do with getting it optimised.

server {
        client_max_body_size 20M;
listen          80;

location / {
                        index  index.html index.htm index.php;
                        error_page 404 = @drupal;
}

location @drupal { rewrite ^(.*)$ /index.php?q=$1 last; }

location ~ \.php$ {
        fastcgi_pass unix:/run/php-fpm/php-fpm.sock;
        fastcgi_index index.php;
        include fastcgi.conf;
}
        }