# PerformanceBottleneckChangeHandler

> You can subscribe to the bottleneck event delegate which sends the PerformanceBottleneckChangeEventArgs when the bottleneck changes.

## Definition

* **Type:** Delegate
* **Namespace:** [UnityEngine.AdaptivePerformance](/engine/6000.7/script-reference/unityengine/adaptiveperformance.md)
* **Assembly:** UnityEngine.AdaptivePerformanceModule

```csharp
public delegate void PerformanceBottleneckChangeHandler(PerformanceBottleneckChangeEventArgs bottleneckEventArgs)
```