Thanks for both feedbacks.
We are using large heuristic images (1053 x 790) for Plots, Welcome text, etc.
For example, the plots are also used as a screen saver on the iPad at the wall, every 5 minutes, this prevents screen burn.
We use the same control pages with Safari on the Mac. At the Mac they work good and fast (except 5 live thumbnail feeds).
The original base+ image is 13 x 11 pixels with the color of the background because this little picture is normally not allowed to appear at the control page.
When the Variable changes to for example base+ "Plot", a beautiful nice plot appears full screen automatically at the screen of the iPad.
This works good with Safari at the iPad and the Mac. But Safari at the iPad gives problems with the nav bar, it's slow and Indigo Touch is made for Indigo and gives faster feedback and feedback sound.
But the problem with Indigo Touch is:
The heuristic images have to all be the same dimensions
(otherwise the heuristic image moves left up)
and
Indigo Touch doesn't use an HTML rendering engine at all,
and
You can create an image that is any size that is 100% transparent alpha
But if we create a 100% transparant heuristic base+ image (1053 x 790), and that image has to be the last one in row (nr. 418), because otherwise it will not be shown last, then this image is superimposed on all other 417 items and the control page has become completely unmanageable. This last image base+ image blocks all control of all other devices at that control page. A simple lamp can then no longer be turned on or off.