Welcome to the Treehouse Community
Looking to learn something new?
Learning codingFront End Web Development Techdegree Student 9,937 Points
Why would you want to cut down searches in the DOM?
If searching in the DOM goes automatically why would you mind about it? I would say press the button and let it search. Or does cutting down searching the DOM improve sites performance like rendering?
Steven Parker220,925 Points
Here's the answer I gave to your previous question on this same issue:
It's primarily a matter of efficiency.
As you suspected, fewer and/or more limited searches improve performance. It's faster to avoid replicating tasks than to do them repeatedly.
Also, there are many times when you have only a specific element to begin with, and DOM traversal will allow you to find a related element where no search could be constructed.