newspaper styles online to css file

I may be wrong, but I thought I read in the update notes for a version of Newspaper that you had added an option to consolidate inline styles into a css stylesheet file.
I can’t find it, does this option still exist?
And if not, how can I optimise the loading of inline styles?
On some slow servers with complex pages, the visual effect is ugly, the page doesn’t render correctly until it’s loaded.
Also, using Google’s Page Speed Insight, often the Computer version preview shows the page without the inline styles applied, and the report is incorrect: the performance counter returns a value of 100%, which is not realistic, and no optimisation tips are shown.
Could you please help me?
Thanks in advance, Luca

Hi Bettina
Sorry to bother you again.
The use of inline css has definitely improved performance, particularly in terms of user experience, on a site running on some not very powerful server, thank you very much.
Thank you also for the optimisation guides, which I have read carefully and I have already put some of the suggestions into practice.
I would like to ask if you have any specific advice about Revolution Slider, which I know is not a TagDiv product, but you offer it bundled.
I have a revolution slider as the first element on the home page of a site: if the connection is not fast, it only appears when the page is fully displayed, with an unpleasant effect.
Can I do something about it?
Thanks again in advance, Luca