Comment 17 for bug 1532202

It would be interesting to know if Kevin's thought is correct:

"Still thinking what could be the root cause. If the swapping (ie, producing gpu traffic) is slowing us down, maybe its a bus traffic jam issue. (and if thats the case, maybe the n7 wouldn't have the problem)"

Anyone got an N7 to try?

In any case, the underlying inefficiency lies in LegacySceneChangeNotification not detailing updates to the scene which leads to all updates scheduling changes to all compositors. If, for example, the system compositor knew which screen had been posted to it would only need to schedule the corresponding display buffer compositor instead of scheduling all.