There really aren’t any PrestaShop themes that could be considered “fast” out of the box. Most lack modern optimizations like preconnects, preloads, and DNS prefetching. That’s why we end up building our own solutions—CSSPro, JSPro, and so on. Unfortunately, most shop admins aren’t familiar with these techniques, and many are understandably wary of third-party modules because of past negative experiences. My advice? Don’t build your business expecting PrestaShop modules to solve all your performance issues—seriously!
I see a lot of people become obsessed with performance, which is understandable, but often they end up with tunnel vision. Without a deeper technical understanding, they’re searching for standard solutions that just don’t exist in the PrestaShop ecosystem. If you want to see how it should be done, just view the source of any Shopify page—you’ll see a different approach entirely (though even Shopify is still missing things like speculative preloading of pages, but that’s coming… even if I have to build it myself!).