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I wrote the most non-idiomatic C# in Unity to create a lighting fast 2D skeletal animation system (100-1000x the performance of the closest competitor) and I'm

I wrote the most non-idiomatic C# in Unity to create a lighting fast 2D skeletal animation system (100-1000x the performance of the closest competitor) and I'm certain I could've gained yet another order of magnitude had I access to C++ instead of C#. C# is fine for scripting, but absolutely terrible for performance critical batching where branch predictions and cache misses are your main optimization points. Also the lack of array slices make it really hard to avoid memory allocations.

vvanders 9y ago
Yeah, that's my biggest gripe with the "GC'd language are as fast as native" crowd. You end up doing all sorts of contortions in order to get the allocation/cache coherency that you need that you're better off using a language that has proper support for it. I love scripting languages for orchestrating logic(luaJIT!) but when you need to massively vectorize your data so that you get full utilization of the prefetcher there really is no substitute.