You do not agree with that? Have you ever looked at the details of your page load time and analyzed what really impacts Page Load Time? Let me show you with a real life example and let me explain that in most cases you only control 1/3 of the time required to load a page as the rest is consumed by 3rd party content that you do not have under control.
Read more http://blog.dynatrace.com/2011/11/08/you-only-control-one-thrid-of-your-page-load-performance/