[ad_1]
Hello,
this question has nothing to do with Ad Inserter. The plugin inserts the codes you configure. If you configured 8 ad codes with this adsbygoogle.js script then the script will be dowloaded that many times – unless it is cached (e.g. by the browser). Of course, only one instance is loaded in the DOM.
However, this script is external – hosted on google, it is not part of the HTML code of your website – therefore it does not contribute to its size.