On macOS, Firefox’s entire window is marked as non-opaque to the compositor and gets fully presented on every event. Chrome has neither issue, probably part of the battery life gap. FF is otherwise quite nice so far though! cc @pcwalton
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They at least at one point used this hack FF could steal for using a CALayer to partial present a GL surface: https://bugs.chromium.org/p/chromium/issues/detail?id=474299 …. Did they switch to using full CALayer based compositing at some point? If so, do you have a link?
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I dunno, I just heard that Chrome uses full CA at the all hands. Didn’t verify; could be wrong.
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