Your Site's DOM Could Be Secretly Sabotaging Your Website
 by Kristi Hagen

Your Site's DOM Could Be Secretly Sabotaging Your Website —by Marty Schmidt

Excessive DOM count is a problem that many site owners and developers don't even know they have until they spot the alert from Google's Page Speed Insights (PSI) or another performance tool.

Here is a typical DOM size alert that appeared after running a webpage through PageSpeedInsights:


Page Speed Insights Results

At the top is PSI's Lighthouse Performance Score in yellow, 88. That means that page performance is not especially bad. On performance metrics, this page ranks at about the 90th percentile among comparable pages. (For more on Lighthouse Scoring and percentiles, click here).

The picture changes, however, as you move down the PSI screen and see the items circled in red. The Excessive DOM count is striking: 3,385 elements—more than twice Google's recommended target of 1,500.

Also, notice the warnings with the other three circled Lab Data and Diagnostic measures: Max Potential first Input Delay (260 ms), Time to Interactive (5.8s), and Main thread work (2.8s). Together, these items show that page performance can still be improved.

What's a DOM?

DOM stands for Document Object Model. Think of DOM Element as just another name for HTML element. The basic building blocks for an HTML page are all DOM elements

Already a member? Sign in here

Read the rest of this article,
and get all this for FREE for 30 days.

  • The Search Engine Strategies Updates for February 2020
  • SEN's Monthly Marketing Podcast for Strategies on the Go
  • Ultimate Guide to Avoiding Google Penalties
  • The Complete Site Audit Checklist
  • The Definitive Local Search Audit Checklist
  • 100's of Strategic SEO Articles and Q&As
  • The Internet Marketing Glossary
  • The Pro SEO's Local Search Directory List
  • 2019 Unfair Advantage SEO Beginner's Book
  • Pro's Ultimate WordPress Plugin Guide
  • The Vault: SEN's Internet Marketing Research Librarys
  • PLUS, as a Full SEN Basic Member, you'll be eligible for hundreds of dollars of discounts on SEO courses ranging from beginner to master on a variety of topics including organic search, local search, and social networking.

  • Your free trial is good for 30 days, until March 20th, 2020.