You have long forum threads with dozens of YouTube videos. Your user’s browser’s performance tanks. We made a small plugin for Vanilla Forums that exchanges YouTube-Videos for their thumbnail and hides the Flash-embed until the thumbnail is clicked. Because the Flash-embed is hidden, the browsers will not load the YouTube .swf files.
You can download the Plugin right here.
We think we will also make this plugin available in the Community Plugin Repository but for now, you can get it here.
If you want to provide us with any screenshots, please feel free to do so.