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Google PageSpeed
delsoijj




msg:4456464
 3:20 pm on May 22, 2012 (gmt 0)

I am noticing that PageSpeed numbers are different (lower) in Google Webmaster Central than they are in Google Analytics (higher). Does anyone else notice the same? If so why do the numbers differ if it is coming from the same source?

 

Igal Zeifman




msg:4457254
 7:52 am on May 24, 2012 (gmt 0)

Analytics sums up the average page speed for your site. This means that "freak" occurrences (page loading for 10 min for a specific user or loading really fast for some one who sits very close to the server) will dramatics change the final score.

WMT tries to benchmark your site and give you the "bigger picture".

I would trust it more.

If you have a speed issues I would also recommend trying out CDN cloud services <snip>
We saw up to 40% improvement due to CDN and our dynamic caching features.

[edited by: incrediBILL at 9:41 am (utc) on May 24, 2012]
[edit reason] removed specifics [/edit]

robzilla




msg:4457287
 9:22 am on May 24, 2012 (gmt 0)

The source is not the same. Site speed data in Analytics is gathered via the Javascript snippet you've placed on your website, while WMT performance data is based on a (generally smaller) sample of data collected directly from visitors using Chrome or the Google Toolbar.

Neither is strictly accurate. Analytics data employs a larger sample (the default is a 1% sampling of all measured traffic), but Javascript is limited in measuring load times, while the graph provided in WMT is based on what's probably a more reliable measurement, but using a relatively small sample.

Note that WMT gives you a hint regarding the accuracy (the number of data points) in the paragraph above the performance graph.

delsoijj




msg:4457419
 3:21 pm on May 24, 2012 (gmt 0)

Ok great, thanks guys!

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