FOR THE IOS PLATFORM:
Not pausing an ad request when your view disappears
When your view goes off screen, you should pause the ad refresh timer, otherwise your ad will run in the background. You do this by calling pauseAdAutoRefresh (see below). If you don’t pause ads when your view goes off screen, you will not only lower your earnings, you will impact your apps’ overall performance.
- (void)viewWillDisappear:(BOOL)animated {
! [super viewWillDisappear:animated];
! [self.adView pauseAdAutoRefresh];
}
Read more at http://blog.mobclix.com/2011/02/24/how-to-increase-your-click-through-rate/#UiI6yqLyE9OEZBMx.99