How can I work out the time my page request spent on my network?
To work out the time your request from the client to the server spent on the network you will need to subtract the server busy time from your page time. This time will then give you the transmission time of your request.
To work out the times it takes your pages embedded objects to download you should use the equation: Page time - Document download time. Please note that this will not include rendering time.
If you are trying to calculate the exact time a request spent on a network it is important to understand that in a LAN network this time should be so minimal as to be negligible. If this is not the case, and the network is a bottleneck, then your environment is not really suitable to hosting load tests as you will be load testing the network, not the server.
To give some kind of approximation of network latency we use page times which measures the time from the FIRST byte of the client request until the LAST byte of the server response including all embedded documents such as images, css files , java applets, etc.
For more details on the timers that SilkPerformer provides please see the resolution What is the difference between Page Times, Document Download Times, Round Trip Times and Server Busy Times ?