HI! THANKS FOR THIS AWESOME CREATION! - I have little question :)

First of all, thank you for this awesome tools. I have question,
Sorry if this is a newbie question.
how to make my website faster for people who already went to my website before?
So it will save cpu usage.

Right now when I press ctrl+r really fast, my website will go down for 5 mins, and then database error, and after sometime, it get back up.

Im soo noob, I know this solution already in the web right now, But I dont have any idea what to google.

Can someone please help explain to me, or point me to the right keyword for this.