How does Google determine page speed?

How does Google determine page speed? In GWT some pages are listed as very slow (8+ seconds). But I have tested on older computers/browsers and they do not take anywhere near that long to load. Why might Google show such high numbers? DisgruntledGoat, UK

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• Category

  Science & Technology

[MaribelDelos]

can i marry your brain? your so good in this, I always watch you video and your really good,

you always answer and explain well everthing...

[wrodpressthemes]

Very interesting!

[Edward Lewis]

Creaky chair!

[WatchCount]

Also try using Google's server-side speed tester (search Google for "page speed online").

I seem to get more reasonable results there. But, then again, it's a "server-to-server" tester, not end-user Google Toolbar samplings as Matt mentioned.