timing.loadEventStart - timing.navigationStart,
        timing.domainLookupEnd - timing.domainLookupStart,
        timing.connectEnd - timing.connectStart,
        timing.responseStart - timing.requestStart,
        timing.responseEnd - timing.responseStart,
        timing.fetchStart - timing.navigationStart

I think we ought to read the specs carefully and experiment a little until we figure out precisely what each of these intervals measures and what sort of things it can usefully indicate. It would be good to come up with descriptive names for each of them.

If you want to give it a shot, you can use this gist to get the data in a way that won't break things on older browsers: https://gist.github.com/4174695