Audit overview
All categories sit comfortably above the 70 threshold; this is a clean audit.
Fix Priority Matrix
5 findingsQuick Wins
3High impact, low effort — start here.
Strategic
2High 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
Your mail setup has problems.
asten.nl fails 2 mail checks: No DMARC record found, SPF evaluation problem: exceeded RFC 7208 10-lookup limit (counted 11 lookup(s)). This is the kind of misconfiguration that sends your mail to spam.
Top Priorities (5)
5 render-blocking <script src> tag(s) without async/defer
Performance issues directly impact user engagement and conversion rates.
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.
External link from app.tolkie.nl lacks integrity attribute
External resource without SRI — if the third-party CDN is compromised, your site executes attacker-controlled code.
External script from analytics.silktide.com lacks integrity attribute
External resource without SRI — if the third-party CDN is compromised, your site executes attacker-controlled code.
Business case
What fixing the audit's findings is worth -- and what ignoring them keeps costing.
Return on investment
€361 investment → €5,538/month returns + EUR 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
6 barrier(s) likely increasing bounce by ~25%.
- Page takes 19.4s to loadUsers abandon at ~3s — you're 16.9s over the 2.5s threshold→ Optimize render-blocking resources, preload the hero image, and compress images
- High main-thread blocking timePage is non-interactive for 393ms after first paint→ Defer third-party scripts and split large bundles
- No Open Graph tagsLinks shared on LinkedIn / Slack / Facebook show bare URLs — referral clicks drop→ Add og:title, og:description, og:image, og:url to the page head
- No structured dataNo rich-result eligibility in Google — lower SERP CTR vs competitors with stars and prices→ Add JSON-LD for your page type (Product, Article, FAQPage, LocalBusiness, …)
- Content is hard to readGraduate-level reading difficulty — limits the addressable audience for product or blog pages→ Shorten sentences; replace jargon with plain language; target Flesch ease ≥60
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
€500.000
- 1 of 2 <nav> elements are unlabeledEAA: EUR 1.000 – EUR 500.000
- Skip navigation link is missing (WCAG 2.4.1)EAA: EUR 1.000 – EUR 500.000
Bounce-Rate Cost
€5.538 /mo
+25.2pp bounce · ~2,517 lost visitors/mo
CPC: EUR 2.20
Bandwidth Waste
€0,65 /mo
8742.4 MB/mo × 0.074 EUR/GB
- Optimize transfer: save ~874 KB per page loadSaves €0,65/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
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.
11.50 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
19.41 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
393 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.
11.50 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.
19.45 s
Desktop
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.22 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.32 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
27 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.003
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.22 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.
2.89 s
Categories
8Performance
5 render-blocking <script src> tag(s) without async/defer
Security
Cross-Origin-Embedder-Policy header is missing
Accessibility
All checks pass
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 Bootstrap sites score 96+ on Content; you're at 71 — closing this gap is the highest-leverage improvement.
Technology stack
TYPO3 CMS, on Apache/PHP, hosted on Apache HTTP Server
Stack Architecture
Matomo Analytics 
TYPO3 CMS 
Bootstrap 5.3.7
FancyBox 3.5.7HSTS Microsoft Microsoft 365 
Monsido 
OpenLayers 
Silktide 
Tailwind CSS 
jQuery 3.7.1
PHP 
Apache Apache HTTP Server All Detected Technologies (15)
Apache is a free and open-source cross-platform web server software.
PHP is a general-purpose scripting language used for web development.
TYPO3 is a free and open-source Web content management system written in PHP.
Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS and JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components.
FancyBox is a tool for displaying images, html content and multi-media in a Mac-style 'lightbox' that floats overtop of web page.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Monsido provides a website management platform that automates processes, ensures regulatory compliance, improves collaboration in web and marketing teams, and streamlines reporting.
OpenLayers is an open-source JavaScript library for displaying map data in web browser.
Silktide is a platform that automatically detects and resolves accessibility, content, and user experience issues on websites.
jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.
Matomo Analytics is a free and open-source web analytics application, that runs on a PHP/MySQL web-server.
Observations (2)
No build tool detected
A framework (Bootstrap) 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
15 technologies identified. A complex stack increases maintenance burden and attack surface. Consider whether all components are actively needed.
Show your score
Drop this badge on your README, marketing site, or status page. It auto-updates every time the audit re-runs and links back to this report.
This badge auto-updates with your latest scan result.
[](https://beavercheck.com/sites/asten.nl)<a href="https://beavercheck.com/sites/asten.nl"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fwww.asten.nl" alt="BeaverCheck Score"></a>https://beavercheck.com/badge?url=https%3A%2F%2Fwww.asten.nlExport & share
Download the audit, share with your team, or grab a fix plan ready to copy into your tracker.
Copies markdown to clipboard
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 · 4h total → projected B (88)
Sprint 1: Quick Wins
+3Highest ROI — low effort, high impact
- · Cross-Origin-Opener-Policy header is missing
- · External link from app.tolkie.nl lacks integrity attribute
- · External script from analytics.silktide.com lacks integrity attribute
Sprint 2: Core Fixes
+1Medium effort, high structural impact
- · Cross-Origin-Embedder-Policy header is missing
- · 5 render-blocking <script src> tag(s) without async/defer