Google hasÂ kept a promise it made last year: Site speed is now a ranking factor in Googleâ€™s algorithm, and is already in place for U.S. searchers. But Google also cautions web site owners not to sacrifice relevance in the name of faster web pages, and even says this new ranking factor will impact very few queries. More on that below, but first the background on todayâ€™s announcement from Google Fellow Amit Singhal and Matt Cutts, head of Googleâ€™s web spam team.
Why Page Speed Matters
The first warning that site speed was on Googleâ€™s radar came last November, whenÂ Cutts said there was â€œstrong lobbyingâ€ inside Google to account for site speed as a new ranking factor. Speaking at SMX West last month, Googleâ€™s Maile Ohye showed a slide indicating that delays of under a half-second impact business metrics.
In addition to the numerous studies over the years that show Internet users prefer fast pages, Singhal says Google ran its own testing on how users respond to page speed, including experiments on Google.com. Singhal and Cutts point to aÂ June 2009 blog post on the Google Research Blog that talked about how Google purposely slowed down its search results to measure the impact on search behavior.
Our experiments demonstrate that slowing down the search results page by 100 to 400 milliseconds has a measurable impact on the number of searches per user of -0.2% to -0.6% (averaged over four or six weeks depending on the experiment). Thatâ€™s 0.2% to 0.6% fewer searches for changes under half a second!
â€œWhen we slow our own users down [on Google.com], we see less engagement,â€ Singhal says. â€œUsers love fast sites. A faster web is a good thing all around.â€
How Google Measures Page Speed
Singhal says there are two primary ways Google will measure page speed:
1.Â Â Â Â How a page responds to Googlebot
2.Â Â Â Â Load time as measured by the Google Toolbar
In December, GoogleÂ added a page speed report to Webmasters Tools in the â€œLabsâ€ section. The report shows how fast your site loads, specifically calls out several pages on your site, and offers suggestions to improve page speed.
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