Video loadings is very slow

When I use prettyphoto for an embedded video, it’s incredibly slow. (Actually, I’ve never managed to wait long enough for it to actually show.) I get the prettyPhoto loading box, but it never expands to the video size, etc.

Am I doing this incorrectly? What I’m doing is:

<img class=”alignnone size-full wp-image-8092″ title=”Tour of Vault Home” src=”/wordpress/wp-content/uploads/2012/10/Slide1.png” alt=”” width=”304″ height=”171″ />

Thanks!

http://wordpress.org/extend/plugins/prettyphoto-media/