I drastically improved the perceived performance of this shop, by 57% on 4G to 91% on slow 3G, both on iPhone 7.
Proof of Concepts
All Proof of Concepts are based on product detail pages, where I create a static before and after situation to get a fair comparison. Some of the Proof of Concepts are done as a (free) showcase or as part of a project or talk.
Tested on several devices from the USA, improvements varied from 38% to 63%.
Although not fixing layout shifts, the First Contentful Paint happens within 1.5 seconds instead of 7.0 seconds, tested on a mobile device, fast 3G internet from abroad (United States).