Comment by Rohansi

This is a mostly Unity-specific issue. Unity unfortunately has a potato for a GC. This is not even an exaggeration - it uses Boehm GC. Unity does not support Mono's better GC (SGen). .NET has an even better GC (and JIT) that Unity can't take advantage of because they are built on Mono still.

Other game engines exist which use C# with .NET or at least Mono's better GC. When using these engines a few allocations won't turn your game into a stuttery mess.

Just wanted to make it clear that C# is not the issue - just the engine most people use, including the topic of this thread, is the main issue.