WPF Freezable–How to improve your application's performances

A Freezable is a special type of object that has two states: unfrozen and frozen. When unfrozen, a Freezable appears to behave like any other object. When frozen, a Freezable can no longer be modified.
A Freezable provides a Changed event to notify observers of any modifications to the object. Freezing a Freezable can improve its performance, because it no longer needs to spend resources on change notifications. A frozen Freezable can also be shared across threads, while an unfrozen Freezable cannot.

if (myBrush.CanFreeze)
{
// Makes the brush unmodifiable.
myBrush.Freeze();
}

<LinearGradientBrush ice:Freeze="True" xmlns:ice="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options" />