I see. Thank you.
One idea is to break down the UIs to different pages. Since there are inter-dependencies, any change in one UI triggers changes in all the other UIs. Other than that, the new version should in fact be faster than before, because now each UI only loads the data it needs.
You could try to break down the UIs so that there are only a few in each page. This should help in devices with slow cpus.
If you do try this, please let me know.