We often find User Actions that show long response times but not much time is charged to "Server" it is all showing up as desktop/browser. How can we dig deeper into the browser response time? In the past it was recommended to try the browser agent. I understand the support for browser agent went away (we are currently at 6.5). Is all of this baked into v6.5+ or is there a plugin we need to try?
The W3C specification contains detailed information about the way browsers have to calculate those metrics.