Why Technical SEO Still Matters in 2025
Content may be king, but without a solid technical foundation, even the best articles never reach page one. In fact, a 2024 Ahrefs study found that 59.75% of pages ranking in Google’s top 10 are over three years old — proof that long-term technical health beats short-term content hacks.
Technical SEO is the backbone that helps search engines crawl, understand, and rank your site. Here is the complete checklist you need for 2025.
Crawlability and Indexing
Make Every Important Page Discoverable
If Google can’t crawl it, it doesn’t exist. Start with these essentials:
- Robots.txt: Ensure you’re not accidentally blocking critical pages. A single misplaced
Disallowdirective can de-index an entire product category. - XML Sitemap: Keep it clean, updated, and under 50,000 URLs. Submit it through Google Search Console.
- Crawl budget optimization: On large sites (10,000+ pages), eliminate duplicate URLs, faceted navigation bloat, and orphan pages. E-commerce platforms like PrestaShop are particularly prone to this.
- Canonical tags: Use self-referencing canonicals on every page and cross-domain canonicals where needed.
Monitor Indexing Health
Use Google Search Console’s Page Indexing report weekly. Look for spikes in “Discovered – currently not indexed” or “Crawled – currently not indexed” — these are red flags.
Core Web Vitals and Page Speed
Google confirmed Core Web Vitals as a ranking signal, and in 2025 the thresholds remain:
| Metric | Good | Needs Improvement | Poor |
|---|---|---|---|
| LCP (Largest Contentful Paint) | ≤ 2.5s | ≤ 4.0s | > 4.0s |
| INP (Interaction to Next Paint) | ≤ 200ms | ≤ 500ms | > 500ms |
| CLS (Cumulative Layout Shift) | ≤ 0.1 | ≤ 0.25 | > 0.25 |
Note that INP replaced FID in March 2024. If you’re still measuring First Input Delay, your data is outdated.
Quick Wins for Speed
- Serve images in WebP or AVIF format (up to 50% smaller than JPEG).
- Implement lazy loading for below-the-fold images and iframes.
- Use a CDN — at Lueur Externe, we deploy AWS CloudFront for clients, reducing global TTFB by an average of 65%.
- Minify CSS and JavaScript; defer non-critical scripts.
Mobile-First Indexing
Google now uses the mobile version of your site for all indexing and ranking. If your mobile experience is broken, your desktop rankings suffer too.
Check for:
- Responsive design across all breakpoints (not just phone and desktop).
- Tap targets at least 48x48 pixels.
- No horizontal scrolling or content hidden behind expandable sections that Google can’t render.
- Font sizes above 16px for body text.
Structured Data and Schema Markup
Structured data helps Google generate rich results — review stars, FAQ dropdowns, product prices, and more. In 2024, pages with structured data earned a 58% higher click-through rate on average compared to plain blue links.
Priority schema types for 2025:
- Product and Offer (for e-commerce)
- FAQPage and HowTo
- LocalBusiness (for service companies)
- Article and BreadcrumbList
- Organization with logo and sameAs links
Validate everything with Google’s Rich Results Test before deploying.
Security and HTTPS
HTTPS is non-negotiable. Beyond that:
- Enforce HSTS headers to prevent protocol downgrade attacks.
- Implement a Content Security Policy (CSP) to mitigate XSS vulnerabilities.
- Regularly scan for mixed content warnings — one insecure image can break the padlock icon.
International and Multilingual SEO
If you target multiple countries or languages, implement hreflang tags correctly. Errors here are extremely common — Google’s John Mueller has called hreflang “one of the most complex aspects of SEO.” Use self-referencing hreflang on every page and ensure reciprocal tags across all language versions.
Conclusion: Turn This Checklist into Action
Technical SEO in 2025 isn’t about ticking boxes once and forgetting. It’s an ongoing discipline — search engines evolve, your site grows, and new issues surface with every deployment.
The checklist above covers the critical pillars: crawlability, speed, mobile readiness, structured data, and security. Tackle them systematically, and you’ll build a foundation that makes every piece of content you publish work harder.
If you’d rather have certified experts handle it, Lueur Externe has been delivering technical SEO audits and performance optimization since 2003. From PrestaShop stores to complex WordPress ecosystems, we know what search engines — and users — expect.