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Unity Developers Can Eliminate GC Spikes Using C# Span and Memory Types

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Garbage collection spikes and frame stutters in Unity games are often caused by repeated, subtle memory allocations in performance-critical code paths. Common C# patterns such as Array.Copy and LINQ operations like Skip().Take().ToArray() allocate new heap memory, which accumulates quickly in tight game loops. C# types Span and Memory offer allocation-free alternatives by creating zero-copy views or slices into existing contiguous memory blocks, including Unity's NativeArray. Span is stack-only and suited for synchronous Burst-compiled jobs, while Memory can be stored on the heap for use in async or broader contexts. Together, these tools integrate with Unity's DOTS and Job System to help developers achieve stable frame rates without triggering the garbage collector.

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Unity Developers Can Eliminate GC Spikes Using C# Span and Memory Types · ShortSingh