Advanced NestJS optimization techniques for production environments handling high traffic volumes. Covers lazy module loading for serverless cold starts, request-scoped caching for multi-tenant security, eBPF tracing for async operations, gRPC health checks for Kubernetes, selective serialization for memory efficiency, TCP kernel tuning, DataLoader for GraphQL N+1 problems, Protobuf WebSocket serialization, distributed cron locks with Redis, and kernel-level rate limiting. Each technique includes implementation code, performance metrics, and real-world impact measurements.