Speed and Core Web Vitals
Google recommends good Core Web Vitals for success in Search. These metrics assess loading, responsiveness and visual stability. Google's own targets are a Largest Contentful Paint within 2.5 seconds, an Interaction to Next Paint under 200 milliseconds and a Cumulative Layout Shift below 0.1.
Google also notes that good scores do not guarantee top rankings, which is why we treat speed as one part of a wider SEO plan.