Of all webshops on the Salesforce e-commerce platform within my Proof of Concepts, Omoda already seems the fastest. Because of this, as well as their A/B testing, speed gains are around 45%;
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.
83% win in First Meaningful Paint metric on desktop with fast 3G internet. That should make a difference towards bounce-rate and conversion, on desktop and mobile.
A comparison resulted in mobile improvement of 0.7 seconds for product detail pages.