The frustration you experience when your computer takes an obscene amount of time to load something, or freezes. The name in derived from the little spinning hourglass that replaces your cursor
Fred: "Last night, my stupid computer to so long to load I smashed the screen in."
Bob: "Dude, you're getting Hourglass Syndrome, you need a new computer."
"This morning my laptop didn't work and my Hourglass Syndrome made me rage at my boss. I need a new job now."