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Firefox drops framerate on fullscreen videos, unless the video is in 1080p
Recently I've noticed (but don't know how long it has been actually going on) that when I fullscreen videos on any website the video looks choppy. Measuring through fraps, on fullscreen videos the framerate drops to a consistent 15 FPS. When not in fullscreen videos run normally. This is not a computer problem as video players like VLC and Google Chrome do not have this same issue. In Firefox, if the video is 1080p, then it runs at normal framerate, which is strange as literally every other resolution will drop frames when the video is fullscreened. I have already disabled addons as well as disabled hardware acceleration, nothing works.
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Hi crapmonkey , This happens with server negotiation behind the scenes. Increase the number of pipelines in about:config if it is set to something smaller than 8. You can also try a different video player.