It is a progress bar to show you the progress of your file to be reviewed. Looks like your theme is close to getting reviewed.
Very impressed. Great job guys.
It’s most likely your hosting. Magento is a beast to run and requires a fast server.
@rosh1958 My comment wasn’t aimed at you, it was aimed at Envato. The system has been broken for years and they still just direct users with this problem to a knowledgebase article.