DebugSettings.EnableFrameRateCounter Property
Definition
Important
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Gets or sets a value that indicates whether to display frame-rate and per-frame CPU usage info. These display as an overlay of counters in the window chrome while the app runs.
public:
property bool EnableFrameRateCounter { bool get(); void set(bool value); };bool EnableFrameRateCounter();
void EnableFrameRateCounter(bool value);public bool EnableFrameRateCounter { get; set; }var boolean = debugSettings.enableFrameRateCounter;
debugSettings.enableFrameRateCounter = boolean;Public Property EnableFrameRateCounter As BooleanProperty Value
bool
true to display the overlay debug counters; otherwise, false.
Remarks
The overlay debug counters have two sets of numbers. The set that appears on the upper left of the screen applies to just your app. The set that appears on the upper right applies to the system overall, and is also accounting for other apps that are drawing to the composited desktop. The right-side counter comes from the Microsoft DirectComposition components that are handling compositing for Microsoft Windows in general. Basically, if you set EnableFrameRateCounter to true, this also calls IDCompositionDeviceDebug.EnableDebugCounters in the underlying components. The result is that both the counters specific to apps using XAML and the Microsoft DirectComposition counters for all apps appear when you debug your app.
The format for the frame-rate counter displayed in the window chrome is:
| App fps | App CPU | … | … | Sys fps | Sys CPU |
|---|---|---|---|---|---|
| 000 | 000 | … | … | 000 | 000 |
| The app's UI thread frame rate, in frames per second. | The CPU usage of the app's UI thread per frame, in milliseconds. | … | … | The system-wide composition engine frame rate, in frames per second. This is typically pegged to 60. | The system-wide overall CPU usage of the composition thread per frame, in milliseconds. |
The App fps value is specifically reporting on the UI thread. There could be a much higher apparent refresh rate happening in your app that's related to the composition thread, but not to the UI thread. For more info on what each thread is responsible for, see Performance best practices for Windows Store apps.
OnLaunched is a good place to change DebugSettings values. Another possibility is the App() constructor.