Recently, I got a problem. There are three computer connected with a switch
to share USB printer on one. When I open a word document and click Print in
File menu on one PC, It took very long time to show the dialog box.

I set another local printer to default, then open the word document to
print, the dialog box showed up very quick. But when I changed printer to the
Shared printer, it went very very slow again.

I can see the lights flashing on swwitch. The most interesting thing is the
third PC has no problem on printing.