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.
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