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I just tried Google PageSpeed Analysis in the developer tools, Google Analytics and the website itself (https://developers.google.com/speed/pagespeed/insights). Now, in each of them I get differing results (sometimes with a difference of 30 points!), which makes it seem unreliable. The FAQs discuss the difference to Webmaster Tools, but in particular the developer tools and website should give me the same results it says.

Why the difference?

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When you say 30 points are you talking about the time it measures for download or for the score out of 100 that some of these tools report to you? –  Stephen Ostermiller May 29 '13 at 14:03
    
Same score out of 100 –  oliver13 May 29 '13 at 19:26
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