Open Bug 1055046 Opened 5 years ago Updated 5 years ago
FPS should be at '60' when not rendering
Currently we can't aim to have the FPS counter at 60 because when we're idle we will stop counting. I suggested that devtools should do an empty refresh tick and count that in their measurement. We should do the same. It's a bit more complicated since we have 2 counters. If we continue to count during idle time than keeping the FPS at 60 means that we're idle which is a good thing. Fixing this means that we could unconditionally ask people to keep the FPS counter at 60 which is good.
If we fix this then there's two use case that the FPS counter will no longer solve: - Knowing if we have needless recomposite. Currently the counter will stop/freeze and/or stay low. If we implement this then counter will not be useful to detect these problems. - Knowing if we have an async animation/scrolling. Currently if the FPS counters are at 60 and 0-15 then you typically have async animation/scrolling.
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