Mobile Cloud Template vs. Mobile Theme Plugin

Hello,

I am using the tagDiv Mobile Theme Plugin for my posts.
Unfortunately the posts are not as customizable as I would like (e.g. header & footer).
For this reason I wanted to use Mobile Cloud Templates >> https://drive.google.com/file/d/1MJTe5sTmIqvAuaRqFfr7SFFG5PM6VlTw/view?usp=sharing
So far everything fits. The page looks good and I reduced the elements a lot, so there are only a few elements.

But the Pagespeed Insights result is very very bad. Have a look at the lab data:

Mobile Theme Enable >> https://drive.google.com/file/d/1Wt03kmaeJl7P-3SEgMED1BYI4ouWS-uH/view?usp=sharing
Mobile Theme Disable >> https://drive.google.com/file/d/1o8imOj1lPIgkgdX0FDmYMJpRKMZsTtuI/view?usp=sharing

How can this be? Did I do something wrong?
I have adjusted the posts so that they are exactly identical in content. Only the footer is different. And then such a big difference? 🙁

Info:
Yes, I have disabled and enabled caching and tested all possibilities. Unfortunately nothing helps.

Thank you very much.
The domain is m o d u s x . d e.
I will send you an e-mail with more information, then you can get a better picture.

Thank you!