Its very costly to server assets from application server like Passenger or Unicorn or Puma. In this case we would prefer to server our statics directly from nginx. This will help application performance and decrease down the memory consumption.

server_static_assets_with_nginx.conf

  # if the request is for a static resource, nginx should serve it directly
location ~ ^/(images|javascripts|stylesheets|system|assets|jwplayer)/*  {
  root /var/www/www.example.com/current/public;
  add_header Last-Modified "";
  add_header ETag "";
  expires max;
  break;
}