Did you post any backlinks in demo live preview and item page to that photos author?
I’m using it: http://asmallorange.com/hosting/cloud/ Totally recommend it! And you can see that my previews are really fast. And i assure you that they are way faster than (mt), even the (dv) service. I have the $30 plan..
Same here, http://www.asmallorange.com/ VPS has my recommendation.