DOM Size Test
About DOM Size Test
This test will check the size of the DOM tree. When a web page is loaded, the browser creates a Document Object Model (DOM) of the page. All the tags in the HTML document are called nodes and the sum of them is translated as the DOM size. A large DOM tree will likely increase memory usage, cause longer style calculations, and may produce slower layout rendering.
In order to pass this test, you need to reduce the DOM size.
Second, you need to remove the unnecessary tags and even refactor or rewrite some parts of the code/template. Another workarounds can be: code splitting (create more pages instead of one long page), consider to lazy load some parts of your website in order to speed up the initial rendering, implement infinite scroll, improve page rendering with content visibility (with the CSS content-visibility property, the browser will skip the styling, layout, and paint until the user scrolls down the page).