Start with the context
Check the final URL, date and test profile. A redirect, consent screen or bot protection can change the page the engine sees. A report is useful only if the loaded content is what you intended to analyze.
Read the four categories separately
Performance, accessibility, best practices and SEO answer different questions. An excellent score in one category does not guarantee the others. SEO checks do not predict Google rankings, and an accessibility audit does not replace human review.
Choose a few measurable fixes
Read each diagnostic’s description. Estimated savings are not necessarily additive. Start with issues whose impact is clear and whose fix can be verified.
Keep a record and retest
Enable local saving to find your reports again in this browser. You can export JSON or print a report to PDF. After changing the website, run several tests under comparable conditions.
PUT IT INTO PRACTICE
Prepare a summary for your developer
- Note the URL, date and profile.
- Choose three priority diagnostics.
- Include the relevant metrics and page preview.
- List the features that must be preserved.
- Agree on a verification scenario after the fix.
Audit names may change between Lighthouse versions. Keep the version and exported raw data to support discussion. A report identifies a technical lead; it does not know business constraints, application dependencies or the actual cost of each fix.
Sources and scope
This guide suggests a working method. No numerical improvement is guaranteed. To check definitions and explore the audits: official documentation.