White flash/flicker effect when transiting between pages in the app (using external class)

I’ve an app with more pages and I need to connect them together (not only the “page-content” but open a new independent page with a different “head” and scripts connections).
I’m using the “external” class but when I open the pages I receive a “flickering” effect, a white flash.

How can I remove the flickering effects with the “external” class in the links?
I’m using the latest version of F7 (2.0.7).

I solved, it was enough to insert the black color for the body background (I’m using the dark theme).