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# preferFastBuild

An option that instructs Metal to build an acceleration structure quickly.

```
static var preferFastBuild: MTLAccelerationStructureUsage { get }
```

## Discussion

Apply this option when you need to reduce the time when creating or refitting an
acceleration structure, such as from code that’s sensitive to runtime performance.

> Note:
> The acceleration structures you build with this option can reduce their intersection performance.

---

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