How can I get the simple and fast preview when I drag floating tool windows? The current preview is slow and it can take several seconds before it renders at all.
We haven't really seen a slowdown with the rafted windows in the past, and there isn't currently an option to change the preview behavior. Do you have a new simple sample project you could e-mail us that shows that slowdown?
This seems to happen when the rafting windows contain Windows Forms Hosts.
An issue that I am having is that if I move the mouse over the rafting window title bar, click and hold the left mouse button, and immediately start moving the mouse, the rafting window will not stay under the mouse pointer. Your library doesn't seem to record the starting position of the mouse until after it has spent several seconds creating a preview. If the mouse is no longer over the rafting window title bar, the movement of the window will be relative to an arbitrary point.
We've updated the code for the next build to turn off this feature if interop compatibility is active. That should help.