# Fast

> Allows algebraically equivalent optimizations (which can alter the results of calculations), it implies: optimizations can assume results and arguments contain no NaNs or +/- Infinity and treat sign of zero as insignificant. optimizations can use reciprocals - 1/x * y, instead of y/x. optimizations can use fused instructions, e.g. madd.

## Definition

* **Type:** Field
* **Namespace:** [Unity.Burst](/engine/6000.6/script-reference/unity/burst.md)
* **Assembly:** UnityEngine.BurstModule

```csharp
Fast = 3
```