Site Speed and
Core Web Vitals Audit
Adding performance analysis to your technical audit workflow.
What It Is
The performance audit within a technical SEO audit establishes the CWV baseline, identifies top-priority performance failures, and maps them to specific fix types. This episode covers how to efficiently conduct a performance review as part of a broader audit — which pages to test, how to interpret field versus lab data, and how to present CWV findings in a client report. No technical audit is complete without a performance analysis; performance findings are often the most compelling section of a client presentation.
Why It Matters
Showing a client their site scores 32 on mobile PageSpeed with a 5-second LCP communicates business impact in a way that canonical tag errors simply don't. Performance findings translate directly into user experience, conversion rates, and measurable revenue impact — making them the most convincing section of any technical audit report and the most natural gateway to a performance remediation retainer.
What Goes Wrong
Understanding where audits fail — and why — is the first step to executing them correctly.
No Field Data Review Before Lab Testing
Running lab tests in PageSpeed Insights without first reviewing field data in Search Console — missing the real-user performance signal that Google actually uses for rankings in favor of synthetic lab scores.
Testing Desktop Instead of Mobile First
Reporting desktop performance scores when Google uses mobile field data for rankings — giving clients an overly optimistic picture of their actual ranking performance signal.
No Fix-Type Categorization
Listing performance issues without categorizing them by fix type — creating an undifferentiated list of problems rather than a structured remediation roadmap clients can act on.
Missing Infrastructure Assessment
Diagnosing front-end performance issues without assessing the infrastructure layer — hosting type, CDN presence, and server-side caching — that determines whether front-end fixes can achieve their full impact.
The Audit Playbook (Interactive SOP)
Check off each step to track your audit progress live!
Tools
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Search Console Core Web Vitals
Free | Field data from real users — the performance signal Google actually uses for rankings and the starting point for every performance audit section -
PageSpeed Insights
Free | Per-page lab data and specific improvement recommendations — run after reviewing field data to identify specific failing elements -
Chrome DevTools Performance Panel
Free | Detailed performance waterfall and main thread analysis — used to identify specific elements and JavaScript tasks causing metric failures
Time Investment
Pro Tip
Always lead with mobile field data from Search Console, not desktop lab scores.
Google ranks based on mobile field data from real users — not desktop lab scores. Showing a client their desktop PageSpeed score of 75 creates false comfort. Showing them their mobile field data LCP of 5.2 seconds affecting 80% of their traffic creates urgency. Leading with mobile field data from Search Console is both the most accurate representation of their ranking signal and the most compelling performance finding you can present.