I previously posted the Page Load Time Control to display the page load time which will let you see exactly how long your pages are taking to load.  I originally planned on having this display on my blog but then realized that not everyone want's/needs to see this kind of information.  So I made a little change to the control running on my page to have the information hidden.  The result is that I can see the page load time but only when I click "View Source"...

This allows me to still benefit from the information but not burden my readers with unnecessary information.  Here's how you can customize the Page Load Control to get the same results.  Simply modify the lblPageLoadTime.Text value to include the comment marks as illustrated below:

That should do it.  Save the control and refresh your page.  You will see the information when you click on "View Source".