Free Optimization Checklist
The Core Web Vitals Optimization Checklist
A metric by metric working guide to LCP, INP and CLS, for developers and site owners who have seen the red bars in Search Console and want to know exactly what to change first.
What you get:
- The published target for each metric, at the 75th percentile, mobile and desktop separately
- A 5-item setup pass so you measure field data before you touch anything
- 11 LCP fixes, 11 INP fixes and 8 CLS fixes, each written as something you can actually do
- The recurring patterns behind most failures, ranked by how often they show up
- A sane order of operations, so you are not optimizing in a random sequence
- A record sheet for your before and after numbers
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Core Web Vitals fail for a small number of repeatable reasons
A hero image the browser does not discover until late. A third party script that owns the main thread for half a second at exactly the wrong moment. An ad slot or a web font that reflows the page after the reader has started reading. The list is short, which is good news: once you know which metric is failing and which pattern is causing it, the fix is usually specific and small. What wastes time is optimizing everything at once and being unable to tell which change helped.
Field data first, lab data second
Lab tools run one simulated load on one device. Your score is assessed on real user loads at the 75th percentile, split by mobile and desktop. The checklist starts by getting you looking at the right dataset, because a lab-only workflow regularly sends teams off fixing something their real visitors never experience.
One metric at a time
LCP, INP and CLS have almost nothing in common mechanically. Lumping them into one list of performance tips is why most advice feels vague. Each metric here gets its own remediation list, and the items marked [DEV] flag where you will want a developer rather than a plugin setting.
Get the checklist
Enter your email above. The full checklist, the pattern table and the record sheet are on the next page.