I think it's SIMD generation. Managed runtimes have a much harder time autovectorizing, because you can't do any static analysis about things like array sizes. Note that the true low-level tools are all clustered around 2-300ms, and that the next level up are all the "managed" runtimes around 1-2s.

The one exception is sort of an exception that proves the rule: it's marked "C# (SIMD)", and looks like a native compiler and not a managed one.