I might have first read about it via DiS but apparently in the Goldeneye speed running community, it’s been discovered that it’s faster if you spend as much time as possible running while looking at the floor - this way, the game has to render and process stuff less often so moves several frame quicker, shaving seconds off level times.
The best part is, this was discovered accidentally by someone new to speed running, who misinterpreted a guide that said “at this point, put your nose to the grindstone and keep running”.
It caused a lot of people to quit the community because apparently it sucked so much fun out of it.