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Hello, everybody. I'm Nick, and in this video, I will talk about the new .NET 11 Runtime Async feature. It completely changes the game in performance for Async Await code and I want to talk about its benefits.

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Nick Chapsas

.NET 11 Preview introduces a major runtime-level change to how async/await works in C#. Instead of compiling async code into a state machine at the IL level, the new approach moves async handling into the runtime via an `AsyncHelpers` class with runtime-implemented methods. This results in significantly less generated IL code, roughly 40 microseconds faster execution in benchmarks, half the memory allocation, and cleaner stack traces on exceptions. To opt in, developers target .NET 11 and enable the `RuntimeAsync` preview feature flag. The change is transparent to existing code and requires no rewrites.

Async Await Just Got A Massive Improvement in .NET