# Sandbox.Physics.PhysicsSettings.UseFixedUpdate

```csharp
bool UseFixedUpdate { get; set; }
```

If false, then instead of operating physics, and UpdateFixed in a fixed update frequency
they will be called the same as Update - every frame, with a variable time delta.

Declared in [Sandbox.Physics.PhysicsSettings](/api/Sandbox.Physics.PhysicsSettings).
Assembly: `Sandbox.Engine`.