Excessive time to log onto another drive.

I have 3 Machines all running Windows 7 and are connect by a Home Group Network. Using Windows Explorer I go to a Shared drive on another machine. Each File is from 1 Gb to 5 Gb in size. I takes ages ( about 15 minutes or so) for my machine to display the contents of the drive from the other Machine. All I can do is to watch the green line at the top of the screen. If after it is...