Magento's default Luma checkout loads a heavy Knockout.js stack, dozens of RequireJS modules, and payment iframes that fight for the main thread. For merchants where checkout is the conversion bottleneck, shaving seconds off load and interaction time pays back faster than another homepage hero image.
We rebuilt checkout in React—React Checkout Pro—for Magento 2 and Hyvä stores that needed Shopify-like speed without leaving Adobe Commerce. Here is what we measured, what surprised us, and what we would do differently.
The problem: checkout is where Core Web Vitals go to die
Homepage optimizations are table stakes. Checkout is different:
More JavaScript. Payment methods, validators, shipping step observers, and third-party scripts stack on one route.
