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9199653
demo site
(Get the code!)
Oh now I understand painting the right Logo takes always longer than painting the left one regardless of using QPixmap or QImage.
Attached you will find a version with four logos. I think the lower row is now significant.
Result:
Qt4.8 Ubuntu Precise, nVidia 310.19, NVS 3100M:
QPixamp: min 14 µs mean 35 µs
QImage: min 14 µs mean 33 µs