You aren’t there just to do things…you’re there to make things. To get something finished, no matter how crappy and ultimately unusable, in the given—insane—time constraint.
One of the best ways to be truly creative—breakthrough creative—is to be forced to go fast. Really, really, really fast. From the brain’s perspective, it makes sense that extreme speed can unlock creativity. When forced to come up with something under extreme time constraints, we’re forced to rely on the more intuitive, subconscious parts of our brain. The time pressure can help suppress the logical/rational/critical parts of your brain. It helps you EQ up subconscious creativity (so-called “right brain”) and EQ down conscious thought (“left brain”).
When you’re crafting something — a final product like a software app, painting, piece of music, etc. — slowing down can make all the difference between crap and not crap. But when you’re trying to make creative breakthroughs, slowing down gives the rational part of your brain all the time it needs to stop an idea before you’re barely aware of it. When it comes to building/creating/playing something you didn’t even know you were capable of, speed is your friend.