Measuring and optimizing for user experience is the future of web performance. Existing metrics like DOM Content Loaded and Onload Time are giving way to user-centric metrics such as visual timings and user timings. But do they ‘paint’ the whole picture? The older metrics and methods provide some useful insight, but to better serve users on the modern web we have to start looking at page ‘interactivity’. Interactivity metrics can provide insight and uncover blind spots not...

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