I must confess that this one had slipped past me… I wasn’t aware that Alexa was now offering performance rankings as well!
Alexa now shows an “average load time” as well as a “comparitive ranking” (i.e. 51% of sites are slower).
Interesting data for your next website analysis!
It’s worth noting that the quoted “1.404 seconds” is about the same as the “repeat view” measurement webpagetest.org (testing from the UK node shows that www.johnlewis.com takes about 7.2 seconds to load with an empty cache, and 1.6 seconds with a primed cache, median values over 5 runs).
Presumably this is an average across all Alexa toolbar users, on all johnlewis.com pages (large and small) with empty and primed caches.