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ListboxDragDropTarget causes massive framerate drop
Framerate (as measured by # of calls to CompositionTarget.Rendering per second) drops by 40-60% for each ListboxDragDropTarget on screen. I'm seeing drops from 30 fps to 12 with just one on screen and it drops down to 8 with two ListboxDragDropTargets.
This is in a game so there's other usercontrols usually moving around, but it's had great performance until the drag and drop control was added.