The Hidden Foundation of Every First-Page Ranking
Your website can have the most compelling content in your industry and the most authoritative backlink profile your competitors have ever seen — but if Googlebot cannot efficiently crawl, render, and index your pages, none of it matters. Technical SEO is the invisible infrastructure that makes everything else work.
Core Web Vitals: The Page Experience Signals That Move Rankings
Google’s Core Web Vitals — Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) — are confirmed ranking factors. An LCP exceeding 4 seconds, an INP above 500ms, or a CLS score over 0.25 signals a poor page experience and suppresses your position in search results. Our technical SEO team diagnoses and resolves every Core Web Vitals failure with precision.
What Our Technical SEO Audit Covers
- Core Web Vitals Audit: LCP optimisation (image compression, render-blocking resource elimination, server response time), INP diagnosis (JavaScript performance), and CLS resolution (layout stability fixes).
- Site Speed & TTFB: Server response time, caching configuration, CDN implementation, image format modernisation (WebP/AVIF), and lazy loading.
- Crawl Efficiency: Robots.txt audit, XML sitemap accuracy, crawl budget management, internal link architecture, and orphan page identification.
- Indexation Analysis: Canonical tag implementation, duplicate content identification, noindex directive review, and Google Search Console coverage audit.
- Structured Data (Schema): LocalBusiness, Product, FAQ, Article, HowTo, and Review schema implementation for rich snippet eligibility.
- JavaScript SEO: Rendering analysis, dynamic content indexation verification, and SPA framework compatibility assessment.
- Mobile-First Compliance: Google indexes the mobile version of your site first — we ensure your mobile experience matches or exceeds desktop in every technical dimension.
- Site Architecture: URL structure, breadcrumb logic, silo architecture, and internal link equity distribution.
“After 3iseo’s technical fixes — primarily LCP improvements and structured data implementation — our rankings moved across the board within six weeks. Things we had been trying to rank for years suddenly appeared on page one.” — SaaS Platform, San Francisco
Technical SEO forms the foundation; on-page SEO and content strategy build on top of it. Start with our free audit — we identify your most critical technical barriers within 24 hours.
Frequently Asked Questions
Common symptoms include declining organic traffic without obvious cause, poor Core Web Vitals scores in Google Search Console, pages not appearing in search results despite being published, and rankings that plateau despite ongoing activity.
Google's Good threshold requires LCP under 2.5 seconds, CLS under 0.1, and INP under 200 milliseconds. Pages in the Poor range are disadvantaged in rankings compared to competitors with Good scores.
Both u2014 we provide a complete technical audit with prioritised recommendations and implement the fixes directly or alongside your development team.
Critical. Google uses mobile-first indexing u2014 the mobile version of your website determines rankings across all devices.
If your website uses React, Angular, Vue, or any framework that renders content client-side via JavaScript, JavaScript SEO is essential. Content rendered only by client-side JavaScript may not be indexed by Google at all.