Speed and emotions ..

Your speed , emotions , age , mentality all these are connected. 

Remember when you feel angry , that raging of hormones makes you think ,talk and act faster . 

When you are again calm , you feel you are living in this present moment and be hopeful again about life and others. That moment will be accompanied by speech which is having a uniform speed and rythm , right ? 

When you are anxious about anything , you misspell words and have a faster heart beat and talk . When you are depressed , sometimes you even become silent or talk very slowly and less words. 

When you are excited , you talk faster in a loud voice . 

Any thing too much or less is told to be controlled by Ayurveda and eastern philosophy schools like Buddhism.

Talking with medium speed and after proper check of facts and thinking will be fine as per ancient wisdom. 

You have found that childishness is having speedy talk and a talk which interrupts others in between. Mature level of talking will be with chosen words with uniform flow and strong voice. There will be meaning for such words , often deeper meanings. These are words of wisdom developed after meditation and continous observation of universe . The unique experiences and their close analysis makes a person be calm amidst the storm and be in their own identity always. 

When other people try to  sway , a person with integrity can only stand tall and talk with strong self confidence often in a calm manner. That shows his or her resilience. That shows they are knowing the innate human nature to exploit and control. 

Be a cyclone controlling the universe with a calm eye inside , yet faster action outside for your cause.