It's just like boxing

If you lift weight your punching speed will decrease

To increase your punching speed, you need to generate more fast twitch muscle fiber

The only way to compensate for genetically allocated amount is to, well, punch fast frequently

Which is to say

Practice so much at it until the movements are ingrained in muscle memory

Brain is like muscle too

When you don't use it often at peak processing

The said peak ceiling will lower gradually

No

Simply because no amount of book will increase your Will power

It is your will

If you will it

You will

Everyone has different pressure and breaking point