When selecting and dragging about 20 QGraphicsItems (with 40x40 pixel pixmaps), move updates are VERY slow. Doing the same with Qt3 Compatibility Library QCanvasItems there is NO delay (all in the same build). We're using Qt 4.3.3 on Windows and Solaris.

I've tried refraining from setting antialiasing and SmoothPixmapTranform render hints -- no noticeable difference in terms of speed. (But the effect of doing so is apparent in terms of graphics quality).

We're not yet ready to build with newer versions of Qt (e.g. Qt 4.4) -- that's coming. Has this been addressed, or is there anything we can do about this?