"Shawn, the PERF add-on can show us which DOM operations were performed by React. Let's see what manipulations React did to the DOM to render the list of books by Dan Brown." said Mike.
"The Perf.printDOM() method tells us the DOM manipulations made by React. It has made only two set innerHTML calls. First one is to render the spinner and second one is to render the list of rows. In between, we see a call to remove, which must be when the spinner was removed from the page."
"Wow, this method looks very handy as it can tell us if React is somehow doing some extra DOM manipulations." said Shawn.
"Yes, but there are more tools for the purpose analyzing the performance. Let's see how much time does React require to render each component. This can be achieved using Perf.printInclusive()." explained Mike.
