Run results for: TreeWalker/ filter vs querySelectorAll vs NodeIterator

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:124.0) Gecko/20100101 Firefox/124.0

Browser: Firefox 124

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

querySelectorAll

1.8M/s

TreeWalker

307K/s

NodeIterator

4K/s

View exact numbers

Test name	Executions per second
✓ querySelectorAll	1,773,503 Ops/sec
TreeWalker	306,646 Ops/sec
NodeIterator	3,809 Ops/sec

HTML Preparation code:

<!-- article out start -->
<article>
  <!-- article in start -->
  <h1>Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
  <!-- article in end -->
</article>
<!-- article out end -->

<!-- article out start -->
<article>
  <!-- article in start -->
  <h1>Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
  <!-- article in end -->
</article>
<!-- article out end -->

<!-- article out start -->
<article>
  <!-- article in start -->
  <h1>Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
  <!-- article in end -->
</article>
<!-- article out end -->

Tests:

TreeWalker
const walker = document.createTreeWalker( document.body, NodeFilter.SHOW_ELEMENT, function(node) { return node.tagName == "H1" ? NodeFilter.FILTER_ACCEPT : NodeFilter.FILTER_SKIP; }, false ); for (let node = walker.nextNode(), i = 0; node; i++, node= walker.nextNode() ) { node.className = 'classy' ; }
querySelectorAll
const elements = Array.from(document.body.querySelectorAll('h1')) for(let el of elements){el.className = 'classy'}
NodeIterator
const walker = document.createNodeIterator( document.body, NodeFilter.SHOW_ELEMENT, function(node) { return node.tagName == "H1" ? NodeFilter.FILTER_ACCEPT : NodeFilter.FILTER_SKIP; }, false ); for (let node = walker.nextNode(), i = 0; node; i++, node= walker.nextNode() ) { node.className = 'classy' ; }