Agency Process — Series Finale

CWV Audit Workflow
for Agencies

How to diagnose, prioritize, and present Core Web Vitals fixes to any client.

Where to find it: PageSpeed Insights > Field Data > Core Web Vitals Assessment > Opportunities & Diagnostics

What It Is

A Core Web Vitals audit is a structured diagnostic process that evaluates a client's LCP, INP, CLS, TTFB, and FCP scores against Google's thresholds, identifies the root causes of any failures, and produces a prioritized remediation plan. Unlike a single-metric investigation, a full CWV audit covers all metrics across both mobile and desktop, examines field data (real-user performance) alongside lab data, and maps findings to specific technical fixes with clear effort and impact estimates. It's a defined, repeatable service that agencies can productize and charge for.

Why It Matters

Core Web Vitals failures are one of the most common issues on client sites and one of the most consistently misunderstood. Most clients know their scores are red but don't know why or what to fix first. Agencies that can walk into a conversation with a clear CWV audit — here's your LCP failure, here's why, here's the fix, here's what it costs to implement — win more technical SEO retainers than agencies that talk about performance in the abstract. This final episode gives you the complete workflow to deliver that audit, every time.

Root Diagnostics

Common Causes

Understanding why this failure occurs is the first step to fixing it permanently.

No Structured Audit Process

Without a defined workflow, CWV audits are ad hoc — different team members check different things in different orders, producing inconsistent findings and missing issues.

Field Data Not Checked First

Agencies start with lab data (PageSpeed Insights lab scores) instead of field data (real-user CrUX data). Field data is what Google uses for ranking — lab data is a diagnostic tool, not the ranking signal.

No Priority Matrix

All CWV issues are treated as equally urgent. Without a priority matrix (impact vs effort), clients don't know where to invest first, and agencies don't have a clear scope of work conversation.

No Client-Facing Deliverable

Findings exist in a spreadsheet or internal notes but aren't packaged as a client-ready document. Without a deliverable, the audit doesn't justify its fee and doesn't create a natural upsell to implementation.

Interactive Standard Operating Procedure

The Fix Blueprint (Interactive SOP)

Check off each step to monitor your implementation progress live!

Implementation Progress: 0% Completed (0/7)

1. Step 1 — Check Field Data First

Open Google Search Console > Experience > Core Web Vitals. This shows field data (real-user CrUX data) for the site. Note which pages are in Poor, Needs Improvement, and Good status for both mobile and desktop. This is your audit starting point — field data is what Google uses for ranking.

2. Step 2 — Run PageSpeed Insights on Key Pages

Select 3–5 representative pages: homepage, a key service/product page, a blog post, and any pages identified as Poor in Search Console. Run each through PageSpeed Insights in Mobile mode first. Record the LCP, INP, and CLS scores. Screenshot the Opportunities and Diagnostics sections for each page.

3. Step 3 — Diagnose Each Failing Metric

For each page with a failing metric, work through the diagnosis: LCP failing? Check the LCP element, image format, size, and preload. INP failing? Open DevTools Performance panel and look for Long Tasks. CLS failing? Record a load in DevTools and look for Layout Shift regions. TTFB over 800ms? Check server response time and caching headers.

4. Step 4 — Build the Priority Matrix

Organize all findings into a 3-tier priority matrix: Quick Wins (under 4 hours, high impact — image compression, font-display, dimension attributes, deferred scripts), Core Fixes (developer hours — caching headers, code splitting, CDN configuration), and Infrastructure (hosting migration, major refactoring). This becomes the scope of work.

5. Step 5 — Quantify the Impact

For each fix, estimate the metric improvement. Use PageSpeed Insights Opportunities to see estimated LCP savings. Reference the research: LCP under 2.5s = 15–25% higher conversions, CLS under 0.1 = 10–15% lower form abandonment. Frame every fix in revenue terms, not just technical terms.

6. Step 6 — Build the Client Deliverable

Package findings into a branded report: (1) Current scores vs Google thresholds — the red/green scorecard. (2) Root cause for each failing metric. (3) Priority matrix with effort estimates. (4) Projected outcome after fixes. This document justifies the audit fee and creates the implementation project conversation.

7. Step 7 — Present and Propose the Retainer

Lead with the scorecard — clients respond immediately to red vs green. Follow with the root cause summary for each metric. Close with the priority matrix and a proposal for a monthly CWV remediation retainer. The audit creates the diagnostic; the retainer implements the fix. Every CWV audit should be designed to open this conversation.

Tools

Google Search Console
Free | Start here — field data CWV report shows real-user scores for the full site, not just individual pages
PageSpeed Insights
Free (pagespeed.web.dev) | Lab data, Opportunities, and Diagnostics — the core diagnostic tool for individual page analysis
Chrome DevTools Performance Panel
Free | Essential for INP and CLS diagnosis — records real interactions and visualizes long tasks and layout shifts

Time to Fix

3–5 hours

To complete a full CWV audit

Ongoing Retainer

Audit opens the door — remediation is the service

Pro Tip

Lead every CWV audit presentation with the mobile scorecard.

Most clients are surprised to learn Google ranks their site based on mobile field data — not desktop, and not lab scores. Opening with the mobile Core Web Vitals scorecard from Search Console (real users, real scores, red/green) creates immediate urgency that a technical explanation never does. The question 'Did you know Google is ranking you based on this?' changes every conversation that follows.

CWV Audit Workflow for Agencies