Temporarily releases the Direct2D and Direct3D graphics memory.
Apps that render with Direct2D and/or Direct3D must call Suspend in response to Application.Suspending. The Direct3D runtime and the graphics driver will discard internal memory buffers allocated for the app, reducing its memory footprint.
In response to Application.Resuming, the apps must call Resume.
For more information, refer to IDXGIDevice3::Trim.