A practical guide to the three-year LTS release that quietly compounds performance and productivity. We unpack C# 14's 'great ceremony reduction'—contextual field in auto properties, enhanced pattern matching with relational and property patterns, and extension blocks and extension properties—to cut boilerplate and improve safety. Then we lift the hood on runtime gains: smarter JIT code generation with physical promotion, better devirtualization, and expansive escape analysis that enables stack allocation for small arrays, closures, and delegates, delivering measurable throughput and lower GC pressure. We also explain the new data-adaptive GC behavior that tunes memory usage in containers to reduce cloud costs, and outline practical migration steps to future-proof AI workloads and hyper-efficient microservices.

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