Well, you're hosting this thing with webazilla in the netherlands. While this will make handling DMCA complaints easier (dmca doesn't exist in the netherlands), it's going to result in terrible slowness that's going to irritate off most of your US users. However, the website may be speedy in certain parts of Europe, and Asia.
You should consider signing up for one of the following CDN services, and using them to distribute your images & videos:
www.voxcdn.net
www.cdnetworks.com
www.akamai.com
They'll basically mirror your content around the globe, and route your users to the nearest server to download from. spankwire.com i know makes use of cdnetworks.com.