@farah@beige.party
They're pretty impressive, but there's actually a good deal more time involved.
At a tournament, the cube is scrambled and then placed under a cover in front of you. You can take the cover off and then spend fifteen seconds inspecting the puzzle. It's okay to pick it up and look at all sides, but you can't make any moves yet. What you can do is identify the pattern and recognize how to solve it. If you're really good you can just look at a standard cube and plan out most if not all of the moves needed.
After inspecting the cube you put it back down, place your hands on the timer, nod to the judge and then grab the cube and start solving. The solve time doesn't start running until your hands come off of the timer so that 2.7s record is really more like 10s of planning, 2.5 seconds of furiously executing the plan, and .2 seconds of moving your hands from the timer to the cube and back.
At most of the tournaments I have been to, anything under a minute to solve a regular 3x3x3 cube is pretty good. The stunt that impresses me isn't just the speed cubing, but _blindfolded_ speed cubing. You have the same time to inspect the cube, but need to identify every move that you're going to make because you'll be applying every one of them without being able to see what you're doing. It's not that different from regular cubing if you're going for world record times like this, because there's no way you're going to stop and look over the cube while solving it, but committing to that before you even see the scramble is impressive.
(Anyway, Hi. I'm absolute rubbish at it myself but spent a lot of time around people who don't just solve cubes for fun, they do it so they will have something to fidget with all day long.)