Displaying Google AdSense ads is a common way to monetize websites. However, many publishers are unaware that placing multiple ad units on a single page can significantly slow down their site, especially on mobile devices. This isn’t just about user experience—it also impacts your SEO, Core Web Vitals, and even AdSense revenue in the long run.
By default, each AdSense unit attempts to load the main adsbygoogle.js library, even if you’ve already included it once. This redundancy leads to heavy JavaScript payloads, render-blocking requests, and longer page load times. You might even see warnings like “Reduce unused JavaScript” or “Use efficient cache lifetimes” in Google PageSpeed Insights.
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