Mobile is the fastest growing platform and it’s important for us to ensure that our sites are set up for long-term success. Recently, we’ve heard questions and concerns about lower than expected click through rate (CTR) and revenue per thousand impressions (RPM) for mobile inventory and we’d like to share some insights as to what may cause this. To understand what’s happening you need to look at your performance reports . Analyzing your AdSense performance allows you to see how well your ads are performing and which devices your ad units were viewed on. To view this report simply log into your AdSense account, click “Performance reports” and select “Platforms” from the “Report type” dropdown. You may notice that your CTR or RPM is lower on mobile than it is on tablet and desktop. This might be caused by one or more of the following reasons: Your site may be displaying suboptimal ad sizes Your responsive design is using the column drop approach You’re not focusing on optimizing for view...