The current template for community ads looks like this:
[![Tagline to show on mouseover][1]][2]
[1]: http://image-url
[2]: http://clickthrough-url
This is rendered in the preview on page load, and it causes a wasted request to http://image-url
. Depending on browser timeout settings the loading indicator may last much longer than needed.
Please use a real URL to avoid the impression of overly long load time for that page.