Every performance pitch leads with rankings. It is the weakest argument available.
What the ranking effect actually is
Core Web Vitals are a tiebreaker. They matter when two pages are otherwise comparable, and they matter much less than relevance, authority or intent match. Fixing your LCP will not outrank a genuinely better page.
What does move
Conversion. A site that responds in 400ms instead of four seconds does not just rank slightly better, it loses far fewer people between landing and enquiry. That is measurable in revenue rather than in impressions.
How to approach it
Set a performance budget and enforce it in CI. Speed that is not enforced automatically decays within two release cycles, because there is always one more script somebody needs.
- Performance
- SEO