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a4607bcbef
This patch (currently WIP) alters the way we determine whether jank is user-visible or not. Instead of measuring the total time spent doing JS, we now use an indicator provided by the vsync driver: how long it takes to deliver the signal from the vsync timer to the main thread. This lets us find out more accurately if there is user-visible jank. In the future, this will also let us add an observer to find out whether the process itself is janky, regardless of JS. --HG-- extra : rebase_source : a538e3cc9d8904f52d4a0e7bad291189986e4e6d |
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