--- title: Async Await Just Got A Massive Improvement in .NET description: .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,... canonical: https://daily.dev/posts/async-await-just-got-a-massive-improvement-in-net-achxjvo1a twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Async Await Just Got A Massive Improvement in .NET | daily.dev og:description: .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,... og:url: https://daily.dev/posts/async-await-just-got-a-massive-improvement-in-net-achxjvo1a og:image: https://api.daily.dev/og/posts/acHXJVO1a.png og:image:alt: Async Await Just Got A Massive Improvement in .NET og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Async Await Just Got A Massive Improvement in .NET **[Nick Chapsas](https://daily.dev/sources/nickchapsas)** · 12 min read · 8 upvotes · 0 comments ## Summary .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. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#performance](https://daily.dev/tags/performance), [#.net](https://daily.dev/tags/.net), [#c#](https://daily.dev/tags/c#) [View this post on daily.dev](https://daily.dev/posts/async-await-just-got-a-massive-improvement-in-net-achxjvo1a) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Async Await Just Got A Massive Improvement in .NET","url":"https://daily.dev/posts/async-await-just-got-a-massive-improvement-in-net-achxjvo1a","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/async-await-just-got-a-massive-improvement-in-net-achxjvo1a"},"datePublished":"2026-02-20T11:45:25.104Z","dateModified":"2026-03-03T09:05:41.530Z","description":".NET 11 Preview introduces a major runtime-level change to how async/await works in C#. 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