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Consider I have a QML rectangle of width ‘w’ and height ‘h’, colored all black. I also have an image of black color having same width and height.
I need to perform some animations on these two.
Will there be an advantage in performance in choosing one over the other?
What and how much of a role will resolution of the image play in making this decision?
If animations not involve scaling, most likely there will no noticeable difference. You can try to do measurements using QML profiler in latest creator.
http://labs.qt.nokia.com/2012/02/07/qml-profiler-update/