Global Performance
6/6 locations ✓Acceptable global latency — average 361ms across 6 locations, fastest from Amsterdam (95ms), slowest from Singapore (964ms). Cloudflare edge cache (DYNAMIC). Cache-Control disables caching (no-store). 2 locations above the 500ms target.
Audit overview
Compliance needs attention; the rest of the categories are in good shape.
Fix Priority Matrix
5 findingsQuick Wins
2High impact, low effort — start here.
Strategic
3High 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.
costdown.org fails 2 mail checks: No DMARC record found, No SPF record found. This is the kind of misconfiguration that sends your mail to spam.
Top Priorities (5)
1 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.
No DMARC record found
Without DMARC, anyone can send phishing emails using your domain name.
No Permissions-Policy header
Permissions-Policy locks down browser APIs you don't use, shrinking the attack surface.
Business case
What fixing the audit's findings is worth -- and what ignoring them keeps costing.
Return on investment
₫2,700,000 investment → ₫34,567,081/month returns + VND 100,000,000 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
4 barrier(s) likely increasing bounce by ~22%.
- Page takes 5.1s to loadUsers abandon at ~3s — you're 2.6s 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 236ms after first paint→ Defer third-party scripts and split large bundles
- 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, …)
- 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
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
VND 100,000,000
- No privacy policy link detectedPDPD: VND 10,000,000 – VND 100,000,000
- Privacy Policy not detectedPDPD: VND 10,000,000 – VND 100,000,000
Bounce-Rate Cost
₫25,955,180 /mo
+21.6pp bounce · ~2,163 lost visitors/mo
CPC: VND 12000.00
Bandwidth Waste
₫3,439 /mo
1719.6 MB/mo × 2000.000 VND/GB
- Optimize transfer: save ~172 KB per page loadSaves ₫3,439/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.
2.16 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
5.12 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
236 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.
2.91 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.
5.13 s
Desktop
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
645 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
992 ms
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.
781 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.
1.09 s
Categories
8Performance
1 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 HSTS sites score 86+ on Compliance; you're at 63 — closing this gap is the highest-leverage improvement.
Top 10% of HTTP/3 sites score 87+ on Compliance; you're at 63 — closing this gap is the highest-leverage improvement.
Technology stack
HSTS, hosted on Next.js, with Cloudflare CDN
Stack Architecture
HTTP/3 
Lucide 
Open Graph 
Priority Hints 
React 
Tailwind CSS 
Webpack 
Cloudflare 
Next.js 15.5.24 Next.js App Router All Detected Technologies (11)
Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.
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.
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.
Lucide is an open-source icon library that provides 1000+ vector (svg) files for displaying icons and symbols in digital and non-digital projects.
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.
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 (HSTS) 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
11 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 · 4h total → projected A (93)
Sprint 1: Quick Wins
+2Highest ROI — low effort, high impact
- · Cross-Origin-Opener-Policy header is missing
- · No Permissions-Policy header
Sprint 2: Core Fixes
+2Medium effort, high structural impact
- · Cross-Origin-Embedder-Policy header is missing
- · No DMARC record found
- · 1 render-blocking <script src> tag(s) without async/defer