1/7/2024 0 Comments Idle timer js1 This approach can reduce user-visible jank on real-world web pages and results in fewer dropped frames. This article describes an approach implemented in the JavaScript engine V8, used by Chrome, to schedule garbage-collection pauses during times when Chrome is idle. Such pauses may result in user-visible jank or dropped frames therefore, we go to great lengths to avoid such pauses when animating web pages in Chrome. While some of these garbage-collection phases can be performed in parallel or concurrently to the application, others cannot, and as a result they may cause application pauses at unpredictable times. The garbage collector interrupts the application to pass over the memory allocated by the application, determine live memory, free dead memory, and compact memory by moving objects closer together. It is a garbage-collected programming language where the application developer does not have to worry about memory management. JavaScript, the lingua franca of the web, is typically used to animate web pages. Such sporadic animation artifacts are referred to here as jank. These are visible to the user and degrade the user experience. A missed deadline will result in dropped frames. Within these 16.6 ms, all input events have to be processed, all animations have to be performed, and finally the frame has to be rendered. An animation will update the screen at 60 FPS (frames per second), giving Chrome around 16.6 milliseconds to perform the update. Google's Chrome web browser strives to deliver a smooth user experience. Idle-Time Garbage-Collection Scheduling Taking advantage of idleness to reduce dropped frames and memory consumption
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