Here are video taken from the following example:
QmlTestLag.zip [filehosting.org]
My graphic cards are Nvidia Quadro NVS 450, Mosaic Is activated, though Widows See only one big screen in its setup:
Video Qt4Quick1 [youtube.com]
Qt4, Quick1, 1 HD Screen qmlviewer: ~12%CPU Animation is smooth
Qt4, Quick1, 4 HD Screen qmlviewer : ~12%CPU Animation is smooth
Video Qt5Quick2 [youtube.com]
Qt5, Quick2, 1 HD Screen qmlscene : ~4%CPU Animation is very smooth
Qt5, Quick2, 4 HD Screen qmlscene : ~12%CPU Animation is really lagging
I have the same behavior when I use our custom main to display the QPML Application, so I think it is a good example. What I would Conclude:
Quick2 is more CPU consumption friendly
CPU is no the limit
Qt Render even the part which does not need to be updated
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