I’ve got a Windows Phone Silverlight app, and there are some numbers to the right when I run the emulator:

What do they mean, and how can I hide them?
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That’s the frame rate counter for the emulator / phone that is on by default whenever you debug. To turn it off, go to App.xaml.cs and comment this line out:
For more information on what the numbers mean (they can be pretty helpful for tracking app performance), see Jeff Wilcox’s post on this.