Crazyload Page Speed Optimizer

Ok so background, we run a multitools store and traffic is mostly phones. Our PageSpeed number sat at 31 for like a year, its 74 now, my partner didnt beleive me and made me screenshot it. Clicking betwen collections feels instant which i think is the preload thing. The guy who onboarded us was patient with my questions. It fights a little with our page builder so that could be smoother.