I think it's all practice, and a little natural talent. Then again I can't say I'm the fastest thinker. That is, I don't know. I've never compared myself.

What you're talking about here takes practice and a super powered brain. But at the same time, maybe you need to be more specific. I ask myself these questions sometimes as well. Try learning a diverse skill set, rounding yourself out. At the same time, know and accept the brain's limitations. For example, you wouldn't start a car in 5th gear. But those are the kinds of things we do with our psychology all the time. Like multitasking, stressing ourselves out, fatiguing our brains, eating shitty food, breathing poorly.

But why is quickness so important?

Drugs, in the right doses, can sometimes help you do this.

Maybe understanding "why" would help as well.