I'm going to go against the grain here..
I did a skills course and I was shown that if you stand up and keep both pedals level, you can corner far quicker, I always used to have my outside foot down, but it was explained to me as that when you're really in twisty sections (so say right, left, right) you waste energy and time moving the pedal.. so into the right and your left foot is down, into the left and you're swapping to get your right foot down etc etc.
By standing up and keeping the pedals level, you move the bike under you, staying up on the pedals and leaning the bike keeps it planted but is far, far quicker
I was sceptical until I tried it, I've never ridden the top section of Cwm Carn so quickly, a couple of people not on the skills session took off after us and we left them, no pedalling, just using momentum and the ground to build speed. My mate who was on the course didn't use the technique and was way behind, second time round he did and was flying
I'll await the flames 😉