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I have a .NET 8 / C# application that I've compiled using AOT and ReadyToRun (R2R) options to maximize startup speed. The application deals with opening a serial port, writing/reading data from it and then closing it.

After the first compile and run, I consistently see approximately 5 seconds, which I've chalked up to the application extracting some .NET assemblies/dependencies for first run. After the first run, most runs are approximately 200 ms long, but every 4-5 invocations of the application, the runtime is closer to 800 ms. I have timestamped my code inside Main and I don't see any differences between the different invocations, so to me this looks like an issue with some startup time incurred due to .NET (re)loading some assemblies.

How can I ensure the application always consistently runs at the average ~200 ms performance instead of the random jumps to ~800 ms? Is there a way to optimize this away?

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    Try using dotnet trace to see if any JIT work happens during the slower runs Commented Oct 10, 2024 at 7:12
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    Could also be an OS problem, like a anti-virus program, a lack of free RAM, etc. Commented Oct 10, 2024 at 11:36
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    There can be many dozens of background processes on a modern computer, any of which could be active or sleeping. Or even major programs (Outlook syncing?). Don't see how to get "consistent runs at the average ~200ms performance" in such an environment, you'd need dedicated hardware with no active 'distractions'. Commented Oct 14, 2024 at 22:17
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    With a "standard" .NET 8 program published as AOT (like dotnet publish -r win-x64 -c Release), there's no dependency left (in general), so no loading of any assembly (beyond Windows native ones). Is this what you're testing? 5 seconds is a lot. Do you have a reproducing project? Commented Oct 15, 2024 at 7:04
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    Maybe some large configuration files are parsed/evaluated on startup? Commented Oct 16, 2024 at 18:08
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