Hi Chad, the issue is due to the HTTP headers that your test server is sending to the browser - it instructs the browser to not cache jpg, etc images. Chrome treats this literally and requests the same images from your server over and over again as you rotate the product which is the delay you experienced. Firefox would also do the same after some time of inactivity. Usually you would want your web server to pass the HTTP headers that request caching for the images but maybe because you have a dev sub domain there you purposely turned that off?
Since you are using Appache, here's a sample of what you would need to add to your .htaccess to start caching the images which will fix the issue:
Header set Cache-Control "max-age=172800, public"
ExpiresDefault "access plus 2 months"
Header unset ETag
Header unset Last-Modified