Google on Monday, said it's now going to take care of the empy spaces on publishers site that result from an unfilled ad unit. To this end, Google will start "automatically collapse unfilled ad units" -- without affecting the look and feel of publishing site.
Publishers interested, should start using "Ad balance" for opted-in to this update—those who are already on Ad balance, are automatically in. "Those of you who had the Show fewer ads lab enabled have been automatically moved over to Ad balance," Google said.
Ad balance is the first example of a Lab that's being made available to all publishers. Once you login to you AdSense account, now you may see a new subtab 'Ad balance' under My ads.
Those who are new, "Ad balance help publishers to find the right balance between the number of ads shown and the user experience on their site" that cab lead to better overall engagement with on site content.
Also, using Ad balance, you can see the affect of the changes in the volume of ads on your earnings. By only showing best-performing ads, "you may see a minimal drop in your earnings," says Google.
However, since an improvement of user experience often leads to users staying longer on site and engaging more with content, may result in an overall earnings increase.
Google said, the update will take place over the next few weeks.
For more details about this new feature, visit this Help Center.