As per Google:
We've noticed that users find your mobile pages much slower to load compared to those of other publishers. This means that you could be missing out on revenue. Our research shows that 53% of visits are likely to be abandoned if pages take longer than 3 seconds to load. We recommend that you take action to make your mobile pages load faster. Faster page loading times improve user engagement and can lead to increased revenue.
How does AdSense calculate your page loading time?
When a user visits your page, the time it takes for their browser to render your page usable is recorded in the
domInteractiveevent. To calculate your mobile page loading time, we use the Navigation Timing API to get the
domInteractivetimings for a sample of the traffic coming to your pages with AdSense ads, then take the median of the samples.
What should I do?
To make your mobile pages load faster, we recommend you try one or more of the following:
- Use the PageSpeed Insights tool to measure the performance of your mobile pages. Another option you could try is Lighthouse, an open-source tool to designed to help improve the performance of your pages.
- Follow the Google Webmasters guide to create Mobile-Friendly Sites.
- Use a responsive web design
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