How does Google determine page speed?

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United States Google Search Central
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Published on ● Video Link: https://www.youtube.com/watch?v=SO4YuDAkplU


Duration: 2:01
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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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Tags:
google
seo
speed