Google AdSense developers have announced that they would now suggest improvements to user’s ad code implementation based on simulations.
The idea is to provide suggestions on how to generate more revenues through the same ad placements by changing the ad size and format.
To generate these new types of notifications, we use our technology to simulate the ad auction for a specific ad unit using different ad type and/or ad format settings. If our simulation shows that any of these changed settings consistently result in higher revenue for that ad unit, we’ll show a recommendation in your account. Please note that these simulations will not affect your live traffic or earnings, and you’ll only see a recommendation if our simulated auction demonstrated increased revenue for your account.
These tips would appear in the home tab of Google AdSense backend.