> Modern .Net is fast, of course, but it's not burst compiled HPC# fast.

Sure, but the fact that it is competitive with Burst makes it disappointing. If I'm going to go through the trouble of writing code in a different (and not portable!) way then it better be significantly faster. Especially when most code cannot be written as Burst jobs unless you use their (new) ECS.

https://github.com/tbg10101/dotnet-burst-comparison

I wonder what those benchmarks would look like with .NET 10 and an AVX512-capable CPU.