Fixit – DOM Size

This test determines if your page DOM (Document Object Model) is excessively large. Larger page DOMs require more memory and their extra complexity require additional data transfer time. Reducing the DOM complexity and size drastically affects page load time.

Checking for DOM size

This test checks to see if the tested page DOM contains less than 700 elements. If too many page elements are detected then the test reports a FAIL.

If you receive a FAIL for this test, you should consider reducing the page complexity and content to reduce the DOM element count.

Reference

This test is based on a YSlow best practice. See http://yslow.org/faq/ for more details.