No doubt that speed affects conversion and user experience.
So how to improve the speed?
🔸Eliminate render-blocking resources
The goal is to reduce the impact of the render-blocking URLs by inlining critical resources, deferring non-critical resources, and removing anything unused.
It's such a large topic that instead of putting articles here, I'd recommend a book by @smashingmag that covers this topic in detail (it has 500+ PAGES O_O)