Hi Nicolas, I've tried your test version and got the same results as mine with r46. This morning I did a "bzr revert -r45" and "bzr update -r45" then a clean build and the slowdown has gone. Note that I didn't revert the trunk, only devlibs. It's not only a matter of bounding boxes: the dragged objects are drawn slowly too and it's not a matter of overloaded drawing because it happens in a clean file with only a rectangle and all snappings off. May this be something related to the hardware more than the OS? You tried on WXP and W7 but didn't specify on which hardware. Luca
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