IMHO, I think its impossible to measure to the infinite level, due to the factors at play, ie.
Server hosted & loads at specific time
Distance to server / its physical location
Server companies upload speed (10Mbits or 100Mbits)
Your local loads / connection speed/ ISP
Your physical system specifications
How much of a site you have viewed and is cached upon your browser.
No doubt there are more that I have missed. To my knowledge from reading, cacheing hasn't been enabled yet / or announced that it had been enabled. Last I read from Kier or Mike was that cacheing is off until further within the development.
A Joomla install on a local melbourne server is far faster to load than the identical Joomla install I have sitting on a US based server, both enterprise level.