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The dragging metaphor breaks down if there are performance issues (which may be an issue over slow internet connections as well). Firefox 2.0 has much longer lag time that Firefox 3.0. The lag time made it really difficult to drag and drop. 1 user was never sure it was even allowed because the portlet kept jumping back to place when she didn't drag it far enough.
Ghosting to show dragging was a well understood cue, but this metaphor broke down in a big way when performance was slow (jerky movement didn't translate).
Green drop target box confused users. 2 users weren't sure what it was supposed to indicate (firefox 2.0), but thought it had to do with where the portlet was picked up from (this may have been due to the slow movement when dragging and drop target not showing up quickly).
Long scrolling while dragging was a problem. 1 user had to get out of her seat in order to keep scrolling to try to drag a portlet from the bottom to the top.
Most users had trouble distinguishing locked portlets from movable portlets