Core Web Vitals Audit & Fix Kit: LCP, INP & CLS Checklist, Tracker & Client Report
$29
Work out why a client site is slow, fix LCP, INP and CLS in the right order and prove the result with field data: 71 checks, 5 test protocols, a tracker and report templates.
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About this product
The trigger is usually one of three things: a red PageSpeed score, a Core Web Vitals email from Search Console, or a client who says the site feels slow. This kit takes you from that moment to a diagnosis, a fix list in priority order and a before-and-after report backed by real-user data.
It covers LCP, INP and CLS on WordPress, Shopify, Webflow, Framer and Next.js sites.
What you get
A 29-page PDF guide. It explains the metrics and their thresholds in plain English and why field and lab data disagree, for example when PageSpeed shows 45 and Search Console says Good. Then come the audit method, five test protocols, the 71-check checklist, fix recipes with code, how to deal with third-party scripts, notes for each platform, scoring and performance budgets, real-user monitoring, collecting before-and-after evidence, reporting, selling the service, scripts for client conversations and a worked example on a made-up site.
A tracker spreadsheet with 8 tabs. On the Pages tab you type the 75th-percentile values and it fills in Good, Needs improvement or Poor and whether the page passes. There is a checklist tab with all 71 checks, an issues log that works out priority and quick wins, and tabs for third parties, before and after, budget and a dashboard.
A white-label audit report in Word: summary, field results, diagnosis, issues and fixes, a plan for third-party scripts, the budget and limitations.
A one-page monthly performance report in Word for care-plan clients.
A quick start for a first audit in about 90 minutes, a START-HERE file and the license.
The five test protocols
Field data from PageSpeed Insights (CrUX) and the Search Console Core Web Vitals report. A lab baseline in Lighthouse 13 on mobile, taking the median of three runs. Tracing the LCP element to its largest sub-part: TTFB, load delay, load duration or render delay. Testing INP interactions with live metrics and CPU throttling, split into input delay, processing and presentation. Hunting layout shifts on load and on scroll, with their likely causes.
The checklist
71 checks in 9 areas: field data and measurement, server response and caching, the LCP element and how it loads, images and media, CSS and web fonts, JavaScript and interactivity, third-party scripts, layout stability, and navigation, back/forward cache and delivery. Each check has a test, the metric it affects and a default severity.
Facts used
Checked on 10 November 2026. Good thresholds at the 75th percentile are LCP up to 2.5 s, INP up to 200 ms and CLS up to 0.1, and poor starts above 4.0 s, 500 ms and 0.25 (source: web.dev). INP replaced FID as a Core Web Vital on 12 March 2024. Lighthouse 13 replaced many audits with insights, and the latest release at the time was 13.6.0. The HTTP Archive Web Almanac 2025 found that only 48% of mobile websites had good Core Web Vitals. Platform notes were checked against the WordPress 6.3, Shopify image_tag and Next.js 16 Image docs.
Who it suits
Freelance web developers and small agencies who build or look after client sites, anyone who wants to sell a scoped speed audit and the fixes after it (package ideas and proposal wording are included), and care-plan providers who want a monthly performance report.
What to know first
Everything is documents and templates, and it works in Excel, Google Sheets, Word, Google Docs and LibreOffice. Field data covers a 28-day window, so the kit shows you how to report lab results now and field results later. There is no promise of a score of 100 or of rankings, and Google says good Core Web Vitals do not guarantee top positions.
License: use it on your own and client sites and deliver white-label reports. Please don't resell or share the kit.
How delivery works
This is a digital download. Checkout happens on Gumroad, which takes the payment and emails you a receipt with the download link straight away. The files also stay in your Gumroad library, and if the product is updated, the new files appear on the same listing.
You can use the files in your own and your clients' projects, but not resell or share them. The license page explains the details. Refunds are handled on Gumroad under its policy. For help with a download, see support.
Questions
LCP, INP and CLS, with platform notes and fix recipes for WordPress, Shopify, Webflow, Framer and Next.js sites.
Lab tests like Lighthouse show what happens on one test run, while field data shows real users over 28 days. The guide explains why they disagree and how to report both.
No. The kit makes no score or ranking promises, and Google says good Core Web Vitals do not guarantee top rankings.
