Hi, I'm doing some research on FastCGI recently. As I see from the FastCGI specification, it does support multiplexing through a single connection. But apparently none of the current web servers, like Nginx, Apache, or Lighttpd supports this feature. I found a thread from nginx dev mailing list back to 2009, stating that multiplexing won't make much difference in performance: http://forum.nginx.by zjerryj - Nginx Mailing List - English