This means that the URL in question has a parent node in the DOM with more than the recommended 60 child nodes.
While browsers can handle larger DOM trees, they are optimized for a maximum of 60 elements wide. A large DOM tree can harm your page performance in multiple ways:
This Hint will trigger for any internal URL with a maximum DOM width over 60 elements wide.
The Hint would trigger for any URL with more than 60 child elements in the DOM, such as the example below:
An optimal DOM tree:
In general, look for ways to create DOM nodes only when needed, and destroy them when no longer needed.
If your server ships a large DOM tree, try loading your page and manually noting which nodes are displayed. Perhaps you can remove the undisplayed nodes from the loaded document, and only create them after a user gesture, such as a scroll or a button click.
Here are a few questions you should ask yourself:
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