Disable Unity Spread

The Spread function is lagging on my laptop and I have, for a long time, tried to find a way to disable it.

Now I have to search no more! Unity Tweak Tool to the rescue.

Open the program, then goto Window management -> Window spread -> Disable.

Spread is used when you click the app icon in the launcher and there are (at least) two available windows for that app.

Installation instructions on Lifehacker.