# PreferFastBuild

> Build a lower quality acceleration structure, minimizing build time but decreasing ray tracing performance.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine.Rendering](/engine/6000.0/script-reference/unityengine/rendering.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
PreferFastBuild = 2
```