IE Development Tool

Limits to inline < style >< script > tags, should be used if less than ~1KB.
http://calendar.perfplanet.com/2011/why-inlining-everything-is-not-the-answer/

Request Timings

Timing details can seem a bit complex at first, but they’re fairly straightforward once you learn a few concepts.

Let’s start with a simple image request from the IETestDrive home page (after clearing the cache – see later), showing Timing details for GraySwooshWatermark.png:

Zooming in to the left-hand side:

The request/response cycle has seven timing components:

• Wait – Time since start of page navigation to when the request started.
• Start – From when the request was created to when it started to be sent.
• Request – When the request was started to be sent to the first response.  Also known as time to first byte.
• Response – Time from first byte to completion of receiving the response.
• Gap – Time between response completion to page load event.
• DOMContentLoaded – Time of DOMContentLoaded event.
• Load (event) – Time of page Load event.