How do you do your analysis so fast??

This is a question from the total beginner. When reading the analysis of the hands played and the reasoning behind this or that way to play a hand - well, it all seems logical. Given a calm place, an hour or so, I'll be able to follow the logic. Very nice. But the question is - how do you manage to do this during the game? Or is it a trick, and you just have to remember the results of the pre-made calculations? Or... something else? I mean I'm not a retard, not that bad with math, but I barely have time to (approximately!) calculate my pot odds (leave alone thinking about what others might have), and often even not that.

I've also noticed something - when trying to reason I'm internally "speaking" the words, as if talking to myself. I know a little about fast reading methods and this is considered a big error there. Do you "speak the words" when you contemplate your move? (I mean along the lines of "If he has KK there's a 30% chance that...")?