Measure LCP, INP, CLS, TTFB, and runtime render performance to guarantee sub-second page loads.
Audits Largest Contentful Paint (LCP < 2.5s), Interaction to Next Paint (INP < 200ms), Cumulative Layout Shift (CLS < 0.1), Time to First Byte (TTFB), total blocking time, and image payload compression.
Canonical test payload dispatched during security surface audits.
LCP: 4.8s (Poor) - Unoptimized 4.2MB hero PNG imageWatch the probe engine test this signature in an isolated sandbox.
Next.js Image Optimization
<img src="/hero-large.png" />
<Image src="/hero-large.png" alt="Hero" width={1200} height={600} priority placeholder="blur" />Use next/image with WebP/AVIF compression and priority flag to achieve sub-second Largest Contentful Paint.
Copy and paste into your editor to refactor this issue automatically.
Test your public domain specifically for Core Web Vitals & Speed Scanner.
Checks commonly evaluated alongside Core Web Vitals & Speed Scanner during surface discovery.
Verify anti-CSRF tokens, SameSite cookie policies, and origin validation on sensitive state-changing routes.
Detect sensitive tokens, passwords, or PII stored in unencrypted localStorage or sessionStorage.
Detect web cache poisoning, password reset link poisoning, and server-side routing hijack via spoofed Host headers.
Audit your site across all 41 vectors automatically on every deploy.