Suppose you are looking at a remote directory containing a large number of files (for example, 400 in my case). In my case, these files are also decently sized (about 10mb each).

Select all files, and drag try to drag them to a folder in the Finder to download them.

You will have to wait several minutes before Cyberduck can initiate the drag (before which point you would obviously give up and after Cyberduck becomes response again you would instead choose to download the items using a menu item).

This extremely slow (and hence unusable) dragging behavior when there are many files should be fixed.