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Dev.to
7/17/2026
The original title is "Network Performance for Web Teams: DNS, TLS, HTTP, CDN, and Cache Rules"

The original title is "Network Performance for Web Teams: DNS, TLS, HTTP, CDN, and Cache Rules"

Original: Network Performance for Web Teams: DNS, TLS, HTTP, CDN, and Cache Rules

Short summary

Walks through network-layer causes of high Time to First Byte before teams reach for theme or plugin rewrites. Covers DNS resolution, TLS handshake, HTTP version, connection reuse, CDN edge routing, and cache policy as sequential hops that each contribute to TTFB. Provides diagnostic tables mapping common causes to practical fixes and recommends multi-region lab testing after any DNS or CDN change.

  • •TTFB is dominated by earlier network hops (DNS, TLS, connect) before theme or plugin work matters
  • •DNS causes include slow resolvers, long CNAME chains, short TTLs, and geo mis-routing — each with specific fixes
  • •TLS 1.3, session resumption, and complete certificate chains reduce handshake round trips that inflate TTFB

Generated with AI, which can make mistakes.

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