How to Fix “Avoid an Excessive DOM Size” in WordPress: A Practical Guide
The PageSpeed recommendation to “avoid an excessive DOM size” is a tricky one for WordPress site owners. There isn’t a plugin that can magically fix this for you. You, the site owner, will need to make some changes to your content.
Most of the articles you’ll find on this topic are going to go into the technical things to do which aren’t possible for non-developers. However, this guide is a practical one for WordPress site owners.