When working with ValueTask in .NET, a common but often overlooked optimization is to check IsCompletedSuccessfully before awaiting. This pattern, prevalent in .NET runtime and ASP.NET Core hot paths, avoids the overhead of the async state machine when the result is already available synchronously. The post explores the rationale behind this approach, comparing it to naive await usage and highlighting performance benefits. For developers building high-throughput services or libraries, adopting this pattern can lead to measurable improvements in latency and memory allocation. The signal is timely as .NET continues to push for better async performance, and understanding these micro-optimizations is key for advanced C# developers.
A deep dive into the ValueTask await optimization pattern used in .NET runtime and ASP.NET Core, explaining why checking IsCompletedSuccessfully first can reduce async overhead.