[neonsunset]

FFI can be a source of performance issues in Go but not in C# (at least not to the same extent), unless you go out of your way to fight the happy path approach.

Sometimes you do have to rethink what you marshal vs what you just manage manually, but that’s what pointers are for (that can be turned into ref Ts for single values and into Span<T>s for slices/arrays/etc). The idea is that performance ceiling of FFI in .NET is as cheap as direct calls.