How to Prioritise Core Web Vitals Fixes for Your Key Pages

By Jim Huang, SEO Digital Marketing Consultant and AI Enthusiast · Last updated · Effort: High

What are Core Web Vitals?

Core Web Vitals are Google's measures of page experience: how fast the main content loads (LCP), how quickly the page responds to input (INP) and how stable the layout is while it loads (CLS).

Page speed scores are everywhere and it is not clear which pages and which metrics deserve engineering time.

Why it matters

Only 48% of mobile sites and 56% of desktop sites pass all Core Web Vitals thresholds, and LCP is the primary bottleneck: only 62% of mobile sites achieve a good LCP score, against 77% good INP and 81% good CLS. LCP responds directly to server response time, image optimisation and render-blocking resources. Real-user data at the 75th percentile on mobile is what Google measures.

Value and limits

  • Practical value: Faster pages improve user experience and repeat visits. SERP01 shows lab performance scores per page and device so you can find the slowest important templates.
  • Limitation: Google says Core Web Vitals are not large ranking factors, and that small or local sites usually should not put them at the top of the list. Many small sites also lack enough field data to be assessed, and lab scores are not the same as real-user data.
  • Effort and payoff: Medium to high effort. High payoff for user experience and conversion, low payoff for rankings alone.
  • Evidence: Confirmed · 2+ sources

How to test it with SERP01

Issue: Speed scores are everywhere, and it is not clear which pages and which metrics deserve engineering time. We group slow pages by template so one fix covers many URLs.

  1. Run a Site Monitor audit that includes your key templates (home, category, product or service, article).
  2. Open the performance results for mobile and desktop and sort pages by score.
  3. Group slow pages by template; one shared template problem often explains many pages.
  4. Check field data for the same pages in Search Console before committing engineering time.
  5. Re-run after changes to compare.

Actionable items

  • Fix the slowest shared template first - start with server response, large images and render-blocking scripts.
  • Prevent layout shift - reserve space for images and embeds.
  • Cut third-party scripts - defer or remove the ones that do not earn their cost.
  • Prioritise the main image - preload the main above-the-fold image and lazy-load the rest.

How SERP01 addresses this

Performance scores sit in the same report as crawl issues, so a slow template shows up next to the pages and problems it affects.

Next step

Want to run this on your own site? Request a code and run the Site Monitor yourself.

Related resources: How to Run a Technical SEO Crawl and Prioritise the Fixes, How to Write and Check Titles, Descriptions and Headings at Scale, How to Audit Schema Markup and Find Missing Types

About the author. Jim Huang is an established SEO Digital Marketing Consultant, SEO Director and AI enthusiast based in Arlington, Virginia. He specializes in search engine optimization strategy, digital growth, and building custom toolsets that leverage artificial intelligence.