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TLS Performance Optimization

Optimizing TLS for better performance without sacrificing security. Session resumption, OCSP stapling, HTTP/2, ECDSA.

TLS Performance Optimization


TLS adds overhead to connections, but proper optimization can minimize performance impact while maintaining security.


Performance Factors


  • **Handshake latency**: Time to establish connection
  • **CPU usage**: Encryption/decryption overhead
  • **Bandwidth**: Encrypted data size
  • **Session resumption**: Reusing previous sessions

    • Optimization Techniques


    1. TLS Session Resumption


    Reuse previous TLS sessions to skip full handshake:

  • **Session IDs**: Server-side session cache
  • **Session Tickets**: Stateless resumption

    • 2. OCSP Stapling


    Include certificate status in handshake:

  • Reduces OCSP lookup time
  • Improves connection speed
  • Maintains security

    • 3. HTTP/2


    Use HTTP/2 over TLS:

  • Multiplexing reduces connections
  • Header compression saves bandwidth
  • Better performance overall

    • 4. Certificate Optimization


  • Use ECDSA certificates (smaller, faster)
  • Keep certificate chains short
  • Use appropriate key sizes

    • Configuration Examples


    Nginx - Session resumption

    ssl_session_cache shared:SSL:10m;

    ssl_session_timeout 10m;

    ssl_session_tickets on;


    OCSP stapling

    ssl_stapling on;

    ssl_stapling_verify on;

    Key Points

    • •TLS adds latency and CPU overhead
    • •Session resumption reduces handshake time
    • •OCSP stapling improves performance
    • •HTTP/2 helps with multiplexing
    • •ECDSA certificates are faster

    Best Practices

    • ✓Enable session resumption
    • ✓Use OCSP stapling
    • ✓Enable HTTP/2
    • ✓Optimize certificate chains
    • ✓Monitor TLS performance

    Common Issues

    • ✗Not enabling session resumption
    • ✗Missing OCSP stapling
    • ✗Long certificate chains
    • ✗Not using HTTP/2
    • ✗Inefficient cipher suites

    Related Topics

    ProtocolsCiphersCertificates

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