I was working on performance critical .net applications. Reasoning about memory layout, cache locality and access patterns are exactly the same as in any other langauge. I don’t understand how that would be any different in a .net. Memory allocations are actually faster in a GC language, given a proper heap size. I’m assuming performance means mostly throughput here.

You probably lose more performance with the IPC/FFI than you gain, so my guess would be it was not a good choice.