The Technical SEO Checklist That Doubled Our Client's Traffic
A step-by-step technical SEO audit checklist we used to grow a client's organic traffic from 12,000 to 58,000 monthly visits in under a year.
Core Web Vitals: The Foundation of Technical SEO
Google's page experience update made Core Web Vitals a confirmed ranking signal. This is not speculation — it is documented in Google's own Search Central documentation. The three metrics that matter are Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift.
| Metric | Target | Tool to Measure | Impact on Ranking |
|---|---|---|---|
| LCP | < 2.5s | Lighthouse, CrUX | High |
| INP | < 200ms | PageSpeed Insights | High |
| CLS | < 0.1 | WebPageTest | Medium |
"Technical SEO is not a nice-to-have. It is the foundation upon which all other SEO efforts are built. Ignore it at your peril."
— Laurent Moreau, SEO Lead at CreativeTag
Crawlability and Indexation: Let Google In
The most beautifully optimized page is worthless if Google cannot find it, crawl it, and index it. Start with your robots.txt file. It should block nothing that you want indexed, and it should point to your XML sitemap location.
Technical SEO Checklist
- Verify robots.txt does not block important pages
- Submit XML sitemap to Google Search Console
- Fix crawl errors in Search Console
- Ensure canonical tags are self-referencing
- Remove or consolidate duplicate content
- Flatten site architecture (max 3 clicks from home)
Page Speed: Every Millisecond Counts
Speed is not just a Core Web Vital metric — it is a competitive advantage. Amazon famously found that every 100ms of latency cost them 1% in revenue.
| Optimization | Typical Impact | Difficulty |
|---|---|---|
| Enable Brotli compression | 20-26% smaller | Easy |
| Implement browser caching | Instant repeat visits | Easy |
| Use a CDN | 50-70% faster globally | Medium |
| Convert images to WebP/AVIF | 30-50% smaller | Medium |
| Lazy load below-fold images | Faster initial paint | Easy |
| Inline critical CSS | 200-400ms faster | Hard |
Schema Markup: Speak Google's Language
Schema markup is structured data that helps search engines understand the context and content of your pages. It is also what powers rich snippets.
- Organization — Homepage and about pages
- LocalBusiness — Contact and location pages
- BreadcrumbList — Navigation context
- FAQPage — FAQ sections
- Article — Blog posts
- Product — E-commerce pages
Case Study: GreenPath Energie
GreenPath Energie came to us with a common problem: great content, terrible technical foundation. Their site was built on an old WordPress theme with 47 plugins and unoptimized images.
| Metric | Before | After | Change |
|---|---|---|---|
| Page Load Time | 4.8s | 1.4s | -71% |
| Crawl Coverage | 67% | 98% | +31pp |
| Core Web Vitals | Failing | All Good | Pass |
| Monthly Organic Traffic | 12,000 | 58,000 | +383% |
"The technical SEO migration paid for itself within three months. Our organic traffic keeps growing month over month."
— Clara Lefevre, Marketing Director at GreenPath Energie
We migrated them to a custom Next.js frontend, optimized every image, fixed the robots.txt and canonical structure, implemented comprehensive schema markup, and reduced average page load time from 4.8 seconds to 1.4 seconds. The lesson: technical SEO is the foundation upon which all other SEO efforts are built.
Expert contributor at CreativeTag. Sharing insights and practical guides to help you grow your digital presence.
