Checkout loads 38% faster on a first visit. That is the load a returning-visitor cache never helped with, and the one that decides whether a buyer continues.
Checkout now loads 38% faster on a first visit. Nothing in the flow moved and nothing was removed. It simply gets to a usable form sooner.
The first load is the one that counts
A buyer arriving at checkout for the first time has nothing cached, and is the buyer least committed to finishing. Most performance work helps the people who were coming back anyway. This one helps the visit that decides the sale.
What changed for the buyer
The page paints and becomes usable sooner on that first visit. The gain is largest on a phone over cellular, which is how a growing share of buyers reach checkout.
Where to find it
Nowhere. It applies to every store, with nothing to switch on.
