Understand LCP, INP, and CLS in a website review Print

Quick answer

Core Web Vitals describe loading, interaction responsiveness, and visual stability. LCP concerns the main visible content, INP concerns responsiveness to interaction, and CLS concerns unexpected layout movement.

Before you begin

Use the report for the correct website and page group. Check its date range, device category, and whether it contains real-visitor data or a simulated laboratory run.

What to do

1. Identify which metric is causing difficulty instead of treating all slow experiences as the same problem. Write down a visible example for each issue.
2. For loading concerns, inspect when the main content becomes visible and what delays its required resources. For responsiveness, reproduce the interaction that feels slow.
3. For layout movement, look for content shifting after images, fonts, banners, or widgets load. Note whether the movement causes accidental clicks or reading difficulty.
4. Plan a targeted change and test its effect under comparable conditions. Avoid removing essential functionality solely to improve a test score.
5. Review field trends after the release has had time to appear in the reporting window. Keep immediate laboratory evidence separate from longer-term visitor data.

How to check the result

A clear report explains which experience improved and how it was measured. Passing a metric does not guarantee every page, device, or customer journey is satisfactory, and performance alone does not guarantee search rankings.

If you need help

If reports disagree, compare their scope, timing, and device assumptions first. Provide the exact report and affected interaction. A report with insufficient field data should be described as incomplete, not automatically passing or failing.

Related help

• Measure website speed before choosing improvements
• Improve a slow-loading homepage hero image
• Review web fonts when text loads slowly or moves

Official references

• Core Web Vitals

Reviewed October 31, 2026. Interfaces, vendor availability, and account features can change. Check your current account before making changes.