I selected a site that I have had in production for some time, but recently upgraded to Drupal 7 & Commerce Kickstart 2.4. The problem was that some of the heavier coded sections of the site would take minutes to load. The front page could take 3-6 seconds to load, and other user pages could take as long or longer. This is a low traffic site.
Test the site on different platforms.
I created a new hosting account with my current host provider to give them a fair shot.