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How are load times displayed in Webmaster Tools calculated?

How are load times displayed in Webmaster Tools calculated? - answered by Matt Cutts

Matt's answer:

CUTTS: We have a question from the Deepesh in New York, who asked, “How does Google calculate site load times in the data it exposes in Google’s webmaster statistics? Is the calculation simply average time to get and receive the HTML content for a page?” And I think the answer is yes. It’s pretty much it, you know, Googlebot sends out the request and then starting from there, we time how long it takes for us to see the request back. So it is the end-to-end time for us to fetch the page or fetch the data from the server, and that’s pretty much it. We’re looking at it from Googlebot perspective. We have no idea how long it takes, you know, any given user to fetch a page, so we can only look at how long Googlebot takes. But that’s essentially what we’re looking at, yes.

by Matt Cutts - Google's Head of Search Quality Team

 

Original video: