Quick answer: Understand LCP, INP and CLS, how to diagnose real-user issues and how to brief a developer on fixes.
Read the three signals
Largest Contentful Paint reflects when the main visible content loads. Interaction to Next Paint reflects responsiveness after user input. Cumulative Layout Shift reflects unexpected movement. Evaluate mobile and desktop separately.
Find the real bottleneck
Compare Search Console, PageSpeed Insights and browser diagnostics. Identify whether slow hosting, oversized images, render-blocking code, fonts, third-party scripts or client-side work affects a whole template.
Prioritize fixes
Start with server response and the main image, then critical CSS and JavaScript, caching, fonts and third-party tags. Give images dimensions to reduce shifts and avoid heavy work during interaction.
Verify after release
Re-test representative templates, monitor errors and wait for field data to refresh. Record the before-and-after metric and the exact release so later regressions have an audit trail.
How to use this guide
Turn the points above into a written brief, assign an owner to each decision and agree how success will be measured before work begins. Keep the first release focused, verify results with real customer and operational data, and improve from evidence instead of assumptions.
Frequently asked questions
Does a green score guarantee rankings?
No. Relevance, usefulness, authority and many other signals also matter.
Why do lab and field scores differ?
Lab tests simulate one visit; field data aggregates real devices, networks and user behaviour over time.
Plan your next step with WaveINO
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Editorial note: This guide is educational. Costs, timelines and results vary by scope, market, platform rules and starting conditions. Last reviewed for the scheduled publication date below.