Now available through WordPress.org at: https://wordpress.org/plugins/asset-finder/
Once you install this plugin you will
For now this tests only the home page. In future releases it will test several pages and may allow the user to select the pages to test.
For now this only displays the assets in a Settings page. Next, it will allow you to set assets to load late or not at all. This will allow site owners to test speed without specific assets and also to remove assets from the Critical Render Path.