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A picture is worth a thousand words
Tracy allows you to add context to each frame, by attaching a screenshot. You can do this with the FrameImage macro.
You will have to do the screen capture and resizing yourself, which can be a bit complicated. The manual provides a sample code that shows how to do this in a performant way.
The frame images are displayed in the context of a frame, for example, when you hover over the frame in the timeline or in the frame graph at the top of the screen.
You can even view a recording of what your application was doing by clicking the Tools icon and then selecting the Playback option. Try it out!
The FrameImage macro is a great way to see what happened in your application at a particular time. Maybe you have a performance problem that only occurs when a certain object is on the screen?