Rules Results generat by tools like Lighthouse or WPageTest. Often a single number or series to evaluate your site. A good performance budget combines different types of metrics, and these can be lock into a specific model. Measuring site performance using the RAIL model RAIL is a user-centric performance model that drives the entire performance thinking process. This model divides the user eperience into key actions touching the screen, scrolling, loading an item and helps define performance goals for each of them. RAIL stands for four distinct aspects of the mobile site lifecycle Response Animation Idle.

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Loading Users have different performance epectations in each of these contets, so performance goals are defin bas on contet and U research into Japan Phone Number List how users perceive latency. model RAIL – introduction to SO Source sw.devrail Make users the focal point of your performance efforts. The table below describes the key indicators of how users perceive performance latency User perception of performance latency to ms Users are eceptionally good at tracking motion and don’t like it when animations aren’t smooth. Animations are perceiv as smooth as long as new frames are render every second.

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That’s ms per frame, including the time it takes for the browser to create an image of the new frame on the screen, which leaves the app about ms to produce the frame. from to ms React to user actions within this time window and users will feel the result is immiate. If this time is etend, the connection between the action and the reaction will be USB Directory broken. to ms During this time frame, everything seems to be part of a natural and continuous progression of tasks. For most users on the w, loading pages or changing views is a task. ms or more Above milliseconds second, users lose focus on the task at hand. ms or more Above , milliseconds seconds, users get frustrat and likely abandon the task.