Since you are long bead like me you deserve one another answer:

Also from another point of view I noticed something. If you don't use Memcache you don't need Varnish. Varnish is "pasato", since not planning to support spdy for a long time as Varnish author said once.

Also I see that your caching layer is actually on application layer. The W3TC plugin you are using.

Still you may add to your configuration. I haven't saw that.

location ~* \.(jpg|jpeg|png|gif|ico|css|js)$ { expires 365d; } 

Also improve what you allow on your web server.

## Only allow these request methods ## if ($request_method !~ ^(GET|HEAD|POST)$ ) { return 444; } ## Do not accept DELETE, SEARCH and other methods ## 

From another point of view I noticed something. If you don't use Memcache you don't need Varnish. Varnish is "pasato", since not planning to support spdy for a long time as Varnish author said once.

Also I see that your caching layer is actually on application layer. The W3TC plugin you are using.

Still you may add to your configuration. I haven't saw that.

location ~* \.(jpg|jpeg|png|gif|ico|css|js)$ { expires 365d; } 

Also improve what you allow on your web server.

## Only allow these request methods ## if ($request_method !~ ^(GET|HEAD|POST)$ ) { return 444; } ## Do not accept DELETE, SEARCH and other methods ##