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).
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.
Factor 4 improvement of the First Meaningful Paint according to PageSpeed Insights.