The claim
Fast, stable, responsive pages support rankings and reduce abandonment, especially where competing pages are otherwise comparable.
What the evidence shows
Google's page experience guidance describes Core Web Vitals, covering loading, interactivity and visual stability, as signals of a good experience, while noting that great page experience does not override having genuinely helpful content. When content quality is similar, experience can be a differentiator. Poor vitals also correlate with higher abandonment before content is even read.