Performance Testing

What is the major difference between dom completed and fully loaded. Could u please tell what is the performance testing on a single page.How it works?. Please tell briefly.

This might help: https://sites.google.com/a/webpagetest.org/docs/using-webpagetest/quick-start-quide#TOC-High-level-Metrics:

Did you mean “Doc” complete instead of “Dom” complete (they are different measurements)?