not working with WP Theater

I’m using WP Theater to display videos from Vimeo on my page and I added the “embedvideo” class to the WP Theater shortcode, and the embedvideo class shows up in the html, but it doesn’t appear to be working. All the videos are still pulling directly from Vimeo, and taking forever to load. There are 13 videos on the page. What am I doing wrong?

The url is https://dwood.staging.wpengine.com/join-us-miami-beach/presentations-and-videos-2017/ – you’ll be prompted for a login – username: [email protected] / password: Sunshine

Thanks for your help.