Portal doesn’t show loading animation when loading iViews

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Symptom
When an iView is loading you do not see the loading animation. The iView looks like it is collapsed until the iView finishes loading and the content appears.
Other terms
automatic height, loading animation, hourglass, collapse, height type,
Reason and Prerequisites
Prerequisites:
The following version is being used: NW04s- SP17 onward, EhP1, EhP2.
The iView is in URL ‘isolation mode’ [...]

Force Loading Animation on appintegrator iViews

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Symptom
Loading Animation doesn’t show while waiting for application integration iView to load.
Other terms
Loading, Animation, Image, Force, iview, Show, Appear, com.sap.portal.reserved.iview.Redirect, Service, AI, Application Integration, appintegrator
Reason and Prerequisites
Remote AI iView(FPN) and WEB Dynpro iView on EP 7.00 and also BSP, Generic and Transaction iView (Web GUI) on EP 7.01/7.02 run inside Page-Builder Request (performance [...]