To understand how a particular website ranks in speed terms you have to test multiple webpages, each page is unique and subject to different factors which could impact page speed.
Pick a few representative webpages from a website and test them with the Google PageSpeed Insights Tool and pay particular attention to the Mobile results.
The PageSpeed Insights Mobile page speed results screenshot above is for a deep WordPress webpage, it’s a test for the WordPress Attachment page: 100% on Google PageSpeed Insights, you can’t get much deeper than WordPress attachments.
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