I would love if everything on a computer were instant. One of the fastest programs I use is Sublime Merge for a Git UI. It opens and does everything so fast, and I love it. Since the first time I opened it, I haven't even opened the previous Git GUI I was using, even though I like both their UIs about the same. I had to buy Sublime Merge, compared to the free app I was using before it.

It's not just me who prefers everything as fast as possible, but true of people in general. Google measured that slowing down loading a search page by only 400ms caused people to do fewer searches. And the biggest reason I heard people say they switched to Chrome was that it was faster than other browsers (which was true for the first couple years after release).