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Dispatch jitter is how much the dispatch interval has changed between frames. It's a measure of sampling smoothness for events that are occurring at a higher rate than the screen is refreshing: * Mouse movement * Clients rendering at swap interval zero * Keyframe animation position Zero jitter is ideal but will practically never happen, and a jitter value of several thousand microseconds will be visible to the naked eye as stutter even if you're maintaining a perfect frame rate. To make the numbers easier to interpret we also log the jitter as a percentage of the refresh interval. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3082>