There’s no reason a simple asset should be freezing your editor for 1 to 5 minutes, and we’ve had no reports of this happening in 4.10 or any other recent versions which leads me to believe it isn’t a version issue. Is any of this project connected to a network drive or source control? Would it be possible that your computer is trying to access the DDC over a network instead of locally? Have you tried setting up a local DDC? Could you provide a DXDiag so I can get an overall idea for the specs of your computer?