The Response time for servers may differ dramatically, depending where you are on the Internet.
No server is overloaded in anyway on our network, all servers are monitored an 5 minute intervals for response times from external machines, that retrieve the home page and log and graph all responses.
The average response times can vary when there are spikes in traffic. Here is a graph of http monitored traffic. The traffic is monitored by retrieving an actual page from a Domain on a server.