Case Study: Technical SEO Audit, Performance Optimization & AI Search Strategy
Organization: Bird Marketing (Client Assessment) My Role: SEO Executive (Technical Focus) - Application Candidate Target Asset: [https://assessment.birdmarketing.co.uk/] Audit Suite: Screaming Frog SEO Spider, Google PageSpeed Insights, W3C Nu HTML Checker Key Impact: Technical Diagnostic | Core Web Vitals Remediation Plan | W3C Code Validation | AEO/GEO AI Search Strategy
Executive Summary
Tasked with auditing Bird Marketing's mock website for public organic indexing and competitive search ranking as part of my role assessment, I conducted a comprehensive technical SEO audit, performance diagnostic, and code validation. Utilizing industry-standard tools—Screaming Frog, PageSpeed Insights, and the Nu HTML Checker—I evaluated the site across speed, crawlability, indexability, accessibility, security, and HTML compliance.
Dimension | Parameter | Tool used |
Full SEO (Technical) | Indexing, links, alt text, and general website attributes | Screaming Frog |
Page speed | Page performance, accessibility, and best practice | Page Speed Insight |
HTML Check | Warnings and errors | Nu Html Checker |
The assessment revealed critical performance bottlenecks, including an unacceptable mobile Largest Contentful Paint (LCP) of 46.1 seconds, render-blocking CSS/JS bundles, missing alt attributes, security header deficits, and erroneous noindex directives blocking organic discovery. I engineered a prioritized technical remediation roadmap alongside a forward-looking Answer Engine Optimization (AEO) and Generative Engine Optimization (GEO) strategy to capture high-intent AI search traffic.
The Technical Baseline: Performance & Core Web Vitals
Given that mobile devices drive over 52% of global search traffic (Statista, 2026), the audit prioritized mobile-first performance as the baseline for user perception and search ranking.
Diagnostic Comparison
Performance Metric | Mobile Audit Baseline DOCX | Desktop Audit Baseline DOCX | Primary Root Cause DOCX |
Performance Score | 55 / 100
| 69 / 100
| Unoptimized theme assets, render-blocking scripts, large media files. |
First Contentful Paint (FCP) | 7.5 s
| 0.8 s
| Heavy CSS/JS render-blocking dependencies on initial page load. |
Largest Contentful Paint (LCP) | 46.1 s
| 5.7 s
| Uncompressed media assets, fetch priority issues, mobile CPU throttling. |
Speed Index | 23.8 s
| 2.8 s
| Sequential resource dependency chains and un-cached assets. |
Cumulative Layout Shift (CLS) | 0.000
| 0.002
| Stable layout rendering across viewports. |
Deep-Dive Technical SEO & Code Audit Findings
An in-depth crawl of the website's 88 internal URLs using Screaming Frog and W3C Nu HTML Checker uncovered several high-severity technical errors impacting indexing, security, and accessibility:
[ Crawl Diagnostics: 88 Internal URLs ]
├── Indexability: 61 Indexable (77.2%) | 18 Non-Indexable / Noindex (22.8%)
├── HTML Validation: 14 URLs (17.7%) contain invalid tags in <head>
├── Media & Alt Text: 52.2% missing alt text | 26.1% missing alt attributes
└── Security Headers: 94.9% missing HSTS, X-Frame, & Content-Security Headers
Image: Screaming Frog SEO technical issues
Technical Issue Matrix & Action Plan
Category | Observed Finding | Technical & Search Impact | Remediation Action |
Crawlability & Indexing | 14 URLs (18.67%) flagged with 'noindex' directives. | Prevents core landing pages from appearing in organic search engine results (SERP). | Audit WordPress CMS settings and remove erroneous 'noindex' meta tags from public pages. |
DOM & Head Syntax | 14 URLs (17.72%) contained invalid HTML elements in <head> (e.g., stray start tags, CSS parse errors). | Causes search engine parsers to misinterpret meta tags and break indexing logic. | Cleanse HTML source code, remove redundant JS type attributes, and fix broken <head> tags. |
Accessibility & ARIA | Invalid ARIA roles and 52.17% missing image alt text. | Impairs screen readers; deprives search engines of visual context for SERP image ranking. | Update image alt text across all media; re-align ARIA roles to accessibility standards. |
Security & Mixed Content | HTTP internal links and missing HTTP Security Headers across 94.94% of URLs. | Triggers browser security warnings, degrading user trust and search authority. | Force HTTPS redirects; implement HSTS, X-Content-Type-Options, and X-Frame-Options headers. |
Browser Console Errors | Broken local images and unauthenticated external BugHerd scripts. | Generates execution errors, increasing page processing overhead and bounce rates. | Replace broken media paths; authenticate or strip obsolete third-party tracking scripts. |
Core Web Vitals & Caching | Short 7-day cache expiration and uncompressed media files. | Forces repeat visitors to re-download heavy assets, degrading mobile load speed. | Convert images to WebP/AVIF, set font-display: swap, and extend browser cache TTL. |
Technical Remediation Roadmap
To systematically resolve these deficiencies, I structured a three-phase optimization workflow:
Phase 1: Code & Security Fixes ──► Phase 2: Performance & Speed ──► Phase 3: Content & Indexing
Phase 1: Critical Code & Security Hygiene (Immediate)
Resolve invalid HTML elements in <head> and repair syntax errors (e.g., illegal characters in tel: attributes).
Enforce HTTPS across all internal assets to eliminate mixed-content flags.
Add essential HTTP security headers across server configurations.
Phase 2: Core Web Vitals & Mobile Optimization (Weeks 1–2)
Compress static image/video assets into modern WebP/AVIF formats and enforce strict width/height attributes.
Defer non-critical JavaScript execution and eliminate unused CSS bundles above the fold.
Preload critical LCP image resources while disabling lazy-loading for above-the-fold hero media.
Extend browser cache TTL based on user return cycles monitored via Google Analytics (GA4).
Phase 3: Search Accessibility & Indexation Verification (Weeks 2–3)
Remove erroneous noindex headers across primary service pages.
Populate descriptive, keyword-relevant alt attributes across all site images.
Fix non-discernible anchor links and establish proper heading element hierarchies (H1 $\rightarrow$ H6).
Re-run Screaming Frog, PageSpeed Insights, and Search Console validation crawls to verify zero critical errors.
Strategic Search Opportunity: AI & Generative Engine Optimization (AEO / GEO)
Beyond resolving technical foundations, I formulated an advanced organic growth strategy targeting Answer Engine Optimization (AEO) and Generative Engine Optimization (GEO):
Targeting Buyer-Intent Long-Tail Queries: Transition from broad keyword stuffing to answering highly specific, problem-based B2B buyer questions.
Structured Data & Schema Architecture: Implement structured FAQ, Organization, and Service Schema markup to provide AI search algorithms (e.g., Google Search Generative Experience, Perplexity, ChatGPT) with clear, extractable entity context.
E-E-A-T Content Publishing: Build a regular publishing engine featuring research-led white papers, client case studies, and industry trend reports to establish domain authority and earn citation in generative AI summaries.
Key Competencies Demonstrated
Technical SEO & Crawl Analysis: Performing deep-dive audits using Screaming Frog to identify indexability, canonical, and header anomalies.
Core Web Vitals & Front-End Performance Optimization: Diagnosing render-blocking scripts, LCP latency, and mobile throttling issues using PageSpeed Insights.
W3C Code Validation & Web Standards: Identifying HTML syntax errors, invalid <head> structures, and ARIA accessibility mismatches.
AEO / GEO Strategy: Aligning technical metadata, structured data, and content architecture with modern AI search engine retrieval models.
Comments