Global Performance
6/6 locations ✓High global latency — average 785ms across 6 locations, fastest from Madrid (205ms), slowest from Sao Paulo (1385ms). No CDN detected. Cache-Control disables caching (no-store). 4 locations above the 500ms target.
Audit overview
Accessibility needs attention; the rest of the categories are in good shape.
Fix Priority Matrix
5 findingsQuick Wins
4High impact, low effort — start here.
Strategic
1High impact, requires investment.
Easy Improvements
0Small gains, minimal effort.
Nothing in this quadrant — good news.
Deprioritize
0Low impact, high effort — do last.
Nothing in this quadrant — good news.
Screenshots
Top Priorities (5)
No favicon or icon links detected
Without a favicon, your tab shows a blank icon and bookmarks look unbranded — amateur signal in every browser surface.
Cross-Origin-Embedder-Policy header is missing
COEP enforces that all embedded resources opt-in to cross-origin embedding — required for cross-origin isolation features.
Cross-Origin-Opener-Policy header is missing
COOP isolates your top-level browsing context from cross-origin windows — without it, popup-based side-channel attacks remain possible.
Unattributable: 481ms CPU time
Informational: CPU time spent on this resource. Total >1s is a perf budget violation.
https://matheo-olsen.fr/: 864ms CPU time
Informational: CPU time spent on this resource. Total >1s is a perf budget violation.
Business case
What fixing the audit's findings is worth -- and what ignoring them keeps costing.
Return on investment
€140 investment → €3,962/month returns + EUR 120,500,000 risk avoided
Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.
Conversion barriers
3 barrier(s) likely increasing bounce by ~11%.
- Page loads in 3.7sEvery additional 100ms above 2.5s costs conversions — you're 1.2s over→ Target <2.5s LCP: defer non-critical scripts and optimize the hero image
- No skip-to-content linkKeyboard and screen-reader users must tab through the entire header on every page→ Add a visible-on-focus <a href="#main">Skip to content</a> as the first focusable element
- 1 broken link(s) on the pageClicks land on 404s — trust drops and the session often ends→ Fix or remove the broken destinations surfaced on the Content tab
Preliminary CRO audit — each barrier links to the tab with detailed analysis.
Remediation cost
Start here for the best return on investment
Cost by category
Cost by effort level
Adjust assumptions
Team composition
Multiplier applied to dev hours to reflect QA, design, and PM overhead. Use Dev only for solo work; Full team for projects with formal review processes.
Rates reflect fully-loaded developer cost including overhead
Warning:Cost of inaction
Compliance Risk
€120.500.000
- No privacy policy link detectedRGPD: EUR 10.000 – EUR 20.000.000
- Trackers detected but no cookie policy foundRGPD: EUR 5.000 – EUR 10.000.000
- Trackers detected but no cookie policy foundRGPD: EUR 10.000 – EUR 20.000.000
Bounce-Rate Cost
€2.481 /mo
+11.3pp bounce · ~1,128 lost visitors/mo
CPC: EUR 2.20
Bandwidth Waste
€0,15 /mo
2003.1 MB/mo × 0.074 EUR/GB
- Optimize transfer: save ~200 KB per page loadSaves €0,15/mo
Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.
Unique monthly visitors from your analytics
Purchases, signups, or key actions
Optional — for revenue estimation
more engaged visitors from reduced bounce
Fix 1 critical issues to capture this value
How this is calculated
Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.
Your site's LCP: → estimated after fixes.
These are estimates based on industry research — actual results vary
Your data stays in your browser — nothing is sent to our servers
Lighthouse
Mobile
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
3.15 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.70 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
162 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.29 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
5.48 s
Desktop
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.74 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.74 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.05 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
1.74 s
Categories
8Performance
Unattributable: 481ms CPU time
Security
Cross-Origin-Embedder-Policy header is missing
Accessibility
No favicon or icon links detected
SEO
All checks pass
Infrastructure
All checks pass
Compliance
All checks pass
Content
All checks pass
Sustainability
All checks pass
How you compare
Where this site stands against peers running the same stack.
Top 10% of Google Search Console sites score 85+ on Compliance; you're at 79 — closing this gap is the highest-leverage improvement.
Top 10% of HSTS sites score 95+ on Infrastructure; you're at 88 — closing this gap is the highest-leverage improvement.
Technology stack
Google Search Console, on Turbopack, hosted on Next.js
Stack Architecture
HTTP/3 
Open Graph 
Priority Hints 
RSS 
React 
Tailwind CSS 
Webpack 
Turbopack 
Next.js 16.1.3 Next.js App Router All Detected Technologies (12)
Next.js is a React framework for developing single page Javascript applications.
The Next.js App Router is a new paradigm for building applications using React's latest features.
Turbopack is an incremental bundler for JavaScript and TypeScript, written in Rust and integrated into the Next.js framework for optimized build performance.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
HTTP/3 is the third major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Priority Hints exposes a mechanism for developers to signal a relative priority for browsers to consider when fetching resources.
RSS is a family of web feed formats used to publish frequently updated works—such as blog entries, news headlines, audio, and video—in a standardized format.
React is an open-source JavaScript library for building user interfaces or UI components.
Webpack is an open-source JavaScript module bundler.
Observations (2)
No build tool detected
A framework (Google Search Console) was detected but no bundler was identified. The build tool may not be detectable from output patterns, or the site may use the framework's built-in bundler.
Complex technology stack detected
12 technologies identified. A complex stack increases maintenance burden and attack surface. Consider whether all components are actively needed.
Show your score
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Fix Plan
Three-week roadmap to ship the audit's findings, with one-click copy targets for your tracker.
Three-week fix plan
2 sprints · 2h total → projected A (91)
Sprint 1: Quick Wins
+4Highest ROI — low effort, high impact
- · No favicon or icon links detected
- · Unattributable: 481ms CPU time
- · https://matheo-olsen.fr/: 864ms CPU time
- · Cross-Origin-Opener-Policy header is missing
Sprint 2: Core Fixes
+1Medium effort, high structural impact
- · Cross-Origin-Embedder-Policy header is missing