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Performance Pitfalls in C# / .NET – List Contains

1 eterm 4 8/9/2025, 2:47:36 PM richardcocks.github.io ↗

Comments (4)

eterm · 10h ago

In this post, I looked at the performance of a popular helper method suggested in the csharp subreddit, a way to avoid using List.Contains.

It looks at the impact of params ReadOnlySpan<T>, of switching to if statements, and how net8 stacks up to the preview net10.

breve · 9h ago

What about AOT compilation? How does that compare?

eterm · 9h ago

That's a good question, I've never tried to benchmark AoT compiled code. I don't know how to do it with BenchmarkDotNET. I believe the way BDM works is that it compiles sub-assemblies to execute the benchmarks, so it would have to be those, not the benchmark runner that would need the AOT compilation step?

breve · 1h ago

It should just be another compilation target. Here's the documentation on NativeAOT with BenchmarkDotNet:

https://benchmarkdotnet.org/articles/configs/toolchains.html...