Network "Monitor" (not activity, but what browser is doing/requesting)

[The Stig]

I require an app, preferably free, which will sit in the background and capture/display what my browser/connection is doing. Basically I want a detailed breakdown of every image/css/code file my browser tries to grab. We're trying to identify a delay somewhere with an internal page of ours on why it is taking so long to load -- they've tried swapping bits in and out and it's proving useless =( -- and they won't let me play with the code !

[DionyShiva]

Google Chrome's built in inspector will track how long images / html / css / etc take to load, and how much of that time was server-side, and how much of it was download time.

[The Stig]

Oooo. That's one browser I don't have. Ta!! Grabbing it!

[Zhais]

Firebug extension on firefox is /incredibly/ useful for web development. I use it all the time to track page requests, step through javascript code, etc.