We have seen use cases with Varnish , where pages can be delivered sub-second to the browsers.
Varnish is usually suitable for applications like Online Newspapers/magazines , Online Classifieds , Media sites which has more read pages and less of write operations (Publish once - Read many scenarios).
By default in Red Hat server it has Firewall settings enabled which will block our setup from responding when requested from browser i.e. only port 22 will be open since our requests come via port 80 it will not be allowed. Hence, to allow access we block Red Hat’s Firewall settings to proceed further. Also we will configure in such a way that this firewall block will be effective even on server restarts.