How to Manage GC Allocations in Unity 6 Using LINQ and ZLinq

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In large-scale Unity projects, frequent small memory allocations — especially from LINQ queries running every frame — can accumulate and trigger garbage collection spikes. Unity 6 enables Incremental GC by default, but this does not make garbage collection faster or eliminate the cost of per-frame allocations. The article recommends avoiding standard LINQ in hot paths such as Update, LateUpdate, and FixedUpdate, while allowing it in editor scripts, build tools, and one-time initialization code. ZLinq is presented as a zero-allocation alternative for frequently called but non-per-frame code, though it is not treated as a universal fix. Developers are advised to profile with Unity's Profiler to confirm actual allocation behaviour rather than relying on assumptions.

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