Fake Fast Detector

Fake Fast Detector exposes sites that look fast in lab tools but feel slow to humans. Enter a URL and hit Probe to see true network-level signals: HTML TTFB and total time, cache headers, cookie on HTML (edge-cache killer), DOM size, external vs inline scripts, first CSS/IMG discovery, and an LCP heuristic (e.g., lazy-loaded hero). If you want, it also compares Edge vs Origin TTFB and pings first CSS/IMG to gauge asset timing. You get a plain-English verdict, a quick checklist to fix, and a downloadable JSON report. No tracking, no sign-up—just honest diagnostics that complement Lighthouse/PSI. Great for CDNs, SEOs, devs, and anyone fighting “fast in slides, slow in life.”

Key features:

• Edge vs Origin TTFB comparison
• Detects Set-Cookie on HTML (edge bypass)
• Cache-policy check (public / s-maxage / max-age)
• DOM tag and script (ext/inline) counts
• First CSS & first IMG discovery + TTFB pings
• LCP laziness heuristic (lazy hero vs prioritized)
• JSON export & copyable summary
• No login, ad-free, privacy-friendly
• Works on any public URL
• Clear “what to fix first” verdict

Why it’s different

• Focuses on server/edge reality, not synthetic lab tricks
• Flags common PSI gaming patterns (cookie on HTML, lazy LCP)
• Lightweight, instant, link-shareable report