Thank you for the provided video.
I tested the First Look example of the RadFileDialogs, however I was not able to replicate the same delay with the dragging operation on my end.
Are you able to observe the same behavior with the First Look example of the RadWindow? Can you replicate the same scenario in a standalone sample project? Additionally, can you share if you have increased the Windows DPI on your end?
I am looking forward to your reply.
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