Analyzer by Lusivision
Website Performance Checker
Measure how a public page is delivered over HTTP. We record time to first byte, compression, caching headers, document and resource weight, image formats, lazy-loading, explicit image dimensions, third-party scripts and render-blocking assets. Largest Contentful Paint, Cumulative Layout Shift and full on-load timing need a browser; we mark those as not available.
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What it checks
Read from one honest fetch
- Time to first byte from the server fetch
- HTTPS and redirect hops
- Compression (gzip, Brotli)
- Caching headers on HTML and resources
- HTML size, resource weight and request count
- Image formats (AVIF, WebP, SVG) and lazy-loading
- Explicit image dimensions to avoid layout shift
- Third-party scripts and font loading hints
- Render-blocking stylesheets and scripts
Questions
Before you read the score
More checkers
Same fetch, other angles
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- Privacy & Compliance CheckerTrackers, consent tooling, first-load cookies, third-party hosts, Google Fonts and embeds. Built with the GDPR in mind.
- Agent Readiness CheckerHow well AI agents can discover, read and use the site: content without JavaScript, real 404s, llms.txt, APIs, MCP. Powered by Is Agentic.
- Technology DetectorSignature-based detection of CMS, frameworks, e-commerce, payments, consent tools, analytics, CDN and hosting, with evidence.
Need a site built, not just measured? Talk to Lusivision or visit lusivision.com.