Hi Kurdi, Thanks for your message. Are you doing a direct comparison by using the same adverts across both plugins?
Ad Injection doesn’t do anything that would delay the loading of the ads (I think!). The ads are inserted into the page as it loads.
Are you using the option to only show ads to search engines (or selected referrers)? This does add some JS to the page, but that does not control the ad loading, it just sets a cookie if the user comes from a search engine. Maybe this could be slowing things down?