In most cases, when input is received from the operating system, it would take anywhere from 0 to 16.67ms for the next frame to occur (1), and at the start of that new frame, we would paint the resulting changes to the UI (the green rectangle). Each segment of the timeline above represents a single frame on the screen and is approximately 16.67ms. Most users currently use 60Hz monitors, which means their monitor displays 60 frames per second. Here you can see a graphical representation of our old painting pipeline: One area in particular that stood out to us was the ‘depth’ of our painting pipeline. We’ve had some pretty solid indications (from tests and proofs of concepts) that we could make our already fast interactions feel even more instantaneous. These are disruptive and perceptible pauses in interaction with the browser. Jank: This is when a site, or in the worst case the browser UI itself, actually becomes unresponsive to user input for a non-insignificant amount of time. A typical threshold for this would be that these interactions occur in under a second. This is something like switching between channels on Slack or selecting an email in Gmail. The lag is sufficient for the user to perceive it, even if they are not distracted from the task at hand. Small but perceptible lag: This is an interaction where the response is not instantaneous and there is enough work involved that it is not expected to be.In general this means we want the results for these interactions to be displayed within 50ms of the user taking an action. You want these to be displayed as swiftly as possible, giving the user a sense of instantaneous feedback. An example is pressing a key on your keyboard in a document or an input field. Instantaneous responsiveness: These are simple actions taken by a user where the browser ought to respond instantly.The meaning of the word responsiveness as used within computer applications can be rather broad, so for the purpose of this blogpost, we will define three types of experiences that can impact the responsive feel of a browser. So, we decided it was time to focus our efforts on responsiveness performance starting with the Firefox June release. Little things can add up, and we want to deliver the best performance for every user experience. But we hadn’t spent much time looking at how quickly the browser responds to little user interactions like typing in a search bar or changing tabs. We have made many page-load and startup performance improvements over the last couple of years which have made Firefox measurably faster. Playing a browser based video game and using your keyboard to control your movements within the video.
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