ASP.NET Core Performance Tuning for High-Traffic APIs

Short summary

A systematic guide to ASP.NET Core performance tuning for high-traffic APIs, covering async correctness, caching, data access, serialization, middleware ordering, and diagnostics. The most common production killer is sync-over-async code (.Result/.Wait()) causing thread pool starvation. The article includes concrete code examples for proper async patterns, CancellationToken usage, and tag-based output cache invalidation.

• •Sync-over-async is the #1 production performance killer — await everywhere
• •Output caching with tag-based invalidation eliminates redundant backend work
• •CancellationToken threading stops wasted work on disconnected clients

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