UX is a practically all-encompassing term to describe SEO. That’s how important it is to deliver a top-notch experience for your website visitors.
There are several page speed tools to help you measure this and see where you stack up.
Beyond page speed, how easily it is for users to consume your content, find what they are looking for, and even contact you like filling out forms, play a major role in their experience on your website. If the experience is regularly measured as poor, you’ll lose ranking ability. If it’s regularly measured well or above average, you’ll see ranking improvements.