TLS Handshake Cost

Connection latency.

Overview

TLS handshake cost recognises that TLS handshakes have real latency and CPU cost. Enabling TLS is the easy decision; reducing handshake cost via 1.3, connection pooling, and session tickets preserves performance for short-lived connections.

• Connection latency. Per-handshake round trips; each TLS handshake adds RTT to the request.
• TLS 1.3 1-RTT. Single round-trip handshake; matches modern TLS, the right default.
• 0-RTT resumption. Returning clients skip handshake; matches mobile workloads where reconnects are frequent.
• Connection pooling plus session tickets. Reuse connections across requests; cached TLS state supports horizontal scale.

The approach

The practical approach: TLS 1.3 as default, connection pooling for reuse, session tickets for cluster-wide resumption, 0-RTT for safe idempotent requests, documented per-tier TLS settings. The team’s discipline produces fast TLS rather than TLS that quietly slows everything.

• TLS 1.3. 1-RTT handshake; the modern default.
• Connection pooling. Reuse connections; avoids handshake on subsequent requests.
• Session tickets. Per-cluster shared session state; supports horizontal scale by sharing resumption state.
• 0-RTT for safe plus documented policy. Resumption for idempotent requests; per-tier TLS settings committed for operational reviews.

Why this compounds

TLS handshake discipline compounds across services. Each handshake reduction produces ongoing user experience improvement; the team’s TLS expertise grows; new services inherit the TLS patterns.

• Better user experience. Lower handshake cost feels faster; the user perceives the page as responsive.
• Better cost efficiency. Less handshake CPU; the same hardware serves more requests.
• Better mobile experience. 0-RTT supports mobile; the reconnect flow does not stall on TLS.
• Institutional knowledge. Each handshake teaches TLS patterns; the team’s transport security muscle grows.

TLS handshake discipline is an operational discipline that pays off across years. Nova AI Ops integrates with TLS telemetry, surfaces patterns, and supports the team’s transport security discipline.