Most teams do not lose performance in one giant bug. They lose it through small managed overheads that keep showing up in hot loops: allocations, garbage collector pressure, and containers that are convenient but not built for the kind of CPU pressure games create.
This module is the reality check. Unity.Collections can help a lot, but not in the childish way of "replace every List with NativeList and call it a day". Some switches are faster, some are slower, and the answer changes again when you bring in Burst, safety checks, and unsafe variants.
Start here: look at one hot path that runs every frame and ask a boring but important question: is this container holding basic value types that could live in a native container instead of a managed one? If the answer is yes, that is your first candidate for NativeArray, NativeList, or one of the parallel-friendly maps and sets.
First warning: do not enable this blindly. Native containers give you more responsibility, not just more speed. The module shows the restrictions that come with them: value-type-only data, allocator choices like TempJob vs Persistent, explicit disposal, and the fact that parallel writes need the right container or writer path.
The proof is here: the benchmark story is not one-dimensional. In the module, Ruben points out that adding 10,000 elements with a regular C# list is about 0.015 ms, while a NativeList with safety checks can be slower at about 0.148 ms. Then the picture flips when you use Burst and the right variant: UnsafeList with Burst lands around 0.005 ms, roughly 3x faster than the managed reference in that case.
CEO/Producer translation: this is how you stop bleeding CPU time through "small" habits that pile up across systems, features, and content.
The members-only module is the full step-by-step playbook: the container taxonomy, allocators, NativeArray-to-Job-System migration path, multi-thread writer gotchas, concrete examples like mesh extrusion and NativeParallelHashMap, plus the benchmark interpretation that tells you when the switch is worth it and when it is not.
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In this module:
- 1. High-Performance Collections: Intro
- 2. Mesh Extrusion with HP Collections
- 3. HP Collection Examples
- 4. Performance Battle & Conclusions
- Project Files & Mindmap
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