Global Performance
6/6 locations ✓Strong global performance — average 124ms across 6 locations, fastest from Singapore (10ms), slowest from Santa Clara (499ms). Fastly edge cache (MISS).
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
Top Priorities (5)
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.
HSTS is missing includeSubDomains
Without includeSubDomains, a forgotten dev subdomain over HTTP can set malicious cookies that ride to the apex.
No DMARC record found
Without DMARC, anyone can send phishing emails using your domain name.
No SPF record found
Security gaps expose your site and users to attacks, eroding trust.
Business case
What fixing the audit's findings is worth -- and what ignoring them keeps costing.
Return on investment
£225 investment → £1,903/month returns
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
4 barrier(s) likely increasing bounce by ~9%.
- No HSTS headerReturning visitors are briefly exposed to downgrade attacks on first request→ Set Strict-Transport-Security: max-age=31536000; includeSubDomains
- No Content-Security-Policy headerHigher XSS blast radius — one compromised script can exfiltrate the checkout form→ Ship a reporting-only CSP first, then enforce once violations are clean
- 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
Cost of inaction
Bounce-Rate Cost
£1,903 /mo
+9.1pp bounce · ~906 lost visitors/mo
CPC: GBP 2.10
Bandwidth Waste
£0.04 /mo
586.2 MB/mo × 0.063 GBP/GB
- Optimize transfer: save ~59 KB per page loadSaves £0.04/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.
1.80 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.84 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
14 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.
1.80 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.
1.84 s
Desktop
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
402 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
414 ms
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.
402 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
415 ms
Categories
8Performance
All checks pass
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 core-js sites score 95+ on Content; you're at 78 — closing this gap is the highest-leverage improvement.
Technology stack
GOV.UK Frontend, on Ruby, with Fastly CDN
Stack Architecture
GOV.UK Frontend GOV.UK Template GOV.UK Toolkit HSTS 
HTTP/3 
Open Graph 
Ruby on Rails 
Varnish 
core-js 3.36.0
Ruby 
Fastly 
Nginx All Detected Technologies (12)
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Ruby is an open-source object-oriented programming language.
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.
Ruby on Rails is a server-side web application framework written in Ruby under the MIT License.
Varnish is a reverse caching proxy.
core-js is a modular standard library for JavaScript, with polyfills for cutting-edge ECMAScript features.
Observations (2)
No build tool detected
A framework (GOV.UK Frontend) 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.
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[](https://beavercheck.com/results/0e1fc944-6878-4d1b-8e98-55ebb98ee1dd)<a href="https://beavercheck.com/results/0e1fc944-6878-4d1b-8e98-55ebb98ee1dd"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fwww.gov.uk" alt="BeaverCheck Score"></a>https://beavercheck.com/badge?url=https%3A%2F%2Fwww.gov.ukExport & share
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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 · 3h total → projected A (93)
Sprint 1: Quick Wins
+2Highest ROI — low effort, high impact
- · Cross-Origin-Opener-Policy header is missing
- · HSTS is missing includeSubDomains
- · No SPF record found
Sprint 2: Core Fixes
+1Medium effort, high structural impact
- · Cross-Origin-Embedder-Policy header is missing
- · No DMARC record found