I want to display a photo of a user. Beneath this photo the names of the people who are ON that photo are displayed. However, I want to load those names AFTER the entire page is loaded...to increase performance so that the user can already view the photo and the names will appear a moment later when they are retreived...

How can I do this? 

I would use ASP.NET AJAX PageMethods/WebService.

You could trigger the javascript call to your PageMethod on window.unload and then fill in the fields as necessary.

Or you could have an UpdatePanel with your label controls in it. Choose not to render the labels unless ScriptManger1.IsInAsyncPostBack == True. Then you trigger a postback on that UpdatePanel via javascript in window.unload by calling __doPostBack('NameOfControlInUpdatePanel,'')

 Just some quick ideas.

This example explains about on demand UI loading. I think this is what you are looking for

http://msmvps.com/blogs/omar/archive/2007/11/09/on-demand-ui-loading-on-ajax-websites.aspx 

http://devarchive.net/loading_user_controls_using_with_page_methods.aspx (Loading User Controls Using ASP.NET AJAX Page Methods )

http://forums.asp.net/t/1232358.aspx

http://disturbedbuddha.wordpress.com/2007/11/26/controlling-the-aspnet-timer-control-with-javascript/

http://blog.devarchive.net/2008/01/displaying-progress-bar-for-long.html

http://disturbedbuddha.wordpress.com/2007/12/10/disabling-a-trigger-control-during-asynchronous-postback/

http://mattberseth.com/blog/2007/07/delay_load_an_updatepanel.html

http://encosia.com/2007/10/03/easy-incremental-status-updates-for-long-requests/