40 checks in Core Web Vitals & Performance. Automated Its subsection has a live automated checker in the engine.
| ID | Check | Passes when |
|---|---|---|
| 4.4.01 | Measure TTFB (field) | <200ms |
| 4.4.02 | Measure TTFB (lab) | <300ms |
| 4.4.03 | Validate server does not queue requests | No queueing |
| 4.4.04 | Validate use of CDN for static assets | Yes |
| 4.4.05 | Validate CDN caching headers (cache-control) | Correct |
| 4.4.06 | Validate CDN edge locations close to visitor | Yes |
| 4.4.07 | Validate HTML caching at CDN (where allowed) | Enabled |
| 4.4.08 | Validate static assets cached for 30+ days | Long TTL |
| 4.4.09 | Validate Brotli/GZIP compression enabled | Yes |
| 4.4.10 | Validate HTTP/2 or HTTP/3 enabled | Yes |
| 4.4.11 | Validate TLS handshakes optimized (OCSP stapling) | Yes |
| 4.4.12 | Validate DNS lookup time < 40ms | Fast |
| 4.4.13 | Validate minimal redirects to reach final URL | ≤ 1 |
| 4.4.14 | Validate server supports keep-alive | Enabled |
| 4.4.15 | Validate use of Cloudflare APO/Next.js SSR caching/Varnish/etc. | Yes |
| 4.4.16 | Validate dynamic caching for SSR pages | Configured |
| 4.4.17 | Validate server CPU baseline performance | Fast cores |
| 4.4.18 | Validate server RAM availability | Sufficient |
| 4.4.19 | Validate no swap usage under load | Zero swap |
| 4.4.20 | Validate server load average < 70% | Healthy |
| 4.4.21 | Validate database queries optimized (<50ms) | Fast queries |
| 4.4.22 | Validate persistent connections to DB | Enabled |
| 4.4.23 | Detect N+1 query patterns | None |
| 4.4.24 | Validate object caching (Redis/Memcached) enabled | Yes |
| 4.4.25 | Validate full-page caching (WordPress/FastCGI/etc.) | Enabled |
| 4.4.26 | Validate HTML caching purge rules correct | Reliable |
| 4.4.27 | Validate edge/server caching for APIs (GraphQL/REST) | Cached |
| 4.4.28 | Validate minimal cold-start delays for serverless functions | Fast |
| 4.4.29 | Validate SSR timing < 250ms | Fast |
| 4.4.30 | Validate worker thread concurrency (Node.js/Elysia/Bun) | Optimal |
| 4.4.31 | Validate firewall/WAF latency overhead minimal | <15ms |
| 4.4.32 | Detect bottlenecks from rate-limiting | Low impact |
| 4.4.33 | Validate CDN routing performance (Cloudflare Argo/AWS Global Accelerator) | Optimized |
| 4.4.34 | Detect large geographic latency variance | Balanced |
| 4.4.35 | Validate no origin cache-bypass when unnecessary | Stable caching |
| 4.4.36 | Validate stale-while-revalidate configured | Yes |
| 4.4.37 | Validate stale-if-error configured | Yes |
| 4.4.38 | Detect excess cookies bloating request size | <1KB |
| 4.4.39 | Validate CDN shielding/origin protection enabled | Yes |
| 4.4.40 | Compute server-speed, CDN & caching composite score | >= 90% |
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