In my point of view, I believe it is because of the number of processes and applications that our machine is already running and configurations in the firewall also since it uses specific protocols, since it is not only running apache as the Dedicated servers, I also believe that the cause of speed in web servers is because they are dedicated and 100% configured to run specific services, this priority of processing and network configurations in firewalls, since the connectivity factor, when there is firewall in the way also greatly reduce the speed of applications for security and access checks.