Ion-spinner warning

On my (3-year-old iPhone) using several <ion-spinner> on a page made the page transitions super slow. When selecting the page in my side menu the page flickered, took ages to load and XCode gave me several weird warnings.

Just a heads up, it is discussed more in RC0/1 - High idle CPU usage on iOS 7 (iPhone 4), https://github.com/driftyco/ionic/issues/3583 etc.