Indesign 14.0.1, german, win7

For comparison in Indesign CS6 create a fresh single-page standard document, DinA4. Create a large textframe with 2 columns on page, fill frame with blind text. Have some styles with GREP styles looking for charactercombinations... (I know GREP styles are computationally intense, that's not the point.)
Click and drag the the textframe with the mouse. The text gets greeked/switched off, the frame border is refreshed/re-drawn like 80 frames per second silky smooth WITH the grep styles. Save the document. Open that document in Indesign CC. Click and drag the frame - it's slow, like 2-5 frames per second slow. Not 80 frames per second smooth.
Delete the GREP styles from the styles and drag the frame now - redraw is smooth.

Please fix. It makes Indesign CC a pain to work with compared to CS6. Worked well for years.

If the preferences setting to automatically find missing fonts is set, there are three major issues:

1/ The background process never times out,
2/ The background process severely degrades InDesign performance for everything else, and
3/ There is no way to manually kill that background process. If we could, then issues 1 and 2 would not be such problems. If the fonts aren't found, or the internet connection is hinky, or if the Adobe servers are under heavy load or having other issues, we could just kill that background process and then either try again later or design an workaround without those missing fonts.

The ability to kill this background process is a glaring design gap. We should be able to kill it, or at least disable it for a document (like we can disable automatic preflight).

Snap to grid and smart guides or any function where cursor automatically snaps to edge, corner, or center point is not working. I am currently using version 16.0. I have restarted the program 5 times. All of these features are check marked and turned on despite the features not working at all.

I will not work on my project because of this issue. I need to rely on the precise support of smart guides and snap to guides in order to do what I have to do. I'm very disappointed with this bug and upset I'm set back so much time. I spend a lot on this software. I'm providing pictures to show the functions are turned on but the cursor does not turn pink and snap to center of circle or edge.

I really need this fixed.

I have a 4K laptop (Dell XPS 15"), and the UI is just too small. Not small as in "I wish it was bigger", but rather "It is impossible to interact with the UI".

From scrolling through forums and such, it seems that this problem exists since 2014 or so, when 4K screens where a rare sighting.
But now these screens are becoming more popular, and the fact that they aren't supported by InDesign is pretty absurd. Especially when other programs (Photoshop, Illustrator, Premier etc.) work completely fine.

I've seen suggestions for workarounds that have to do with setting the program DPI and the scaling that Windows does, but the only thing it does is stretch the UI to the point of bad pixelation and an overall bad experience.

Thanks!

Assume that I have selected some text which contains instances of bold, italic, or other "styles" (not INDD "styles," but variations of a typeface within a specific font family).

In previous versions of InDesign, I used to be able to change the typeface of the selected text, and maintain all instances of bold, italic, etc. In newer versions of InDesign, this is only possible when I navigate to the new font family by scrolling through the menu; when I search for a font family, I am presented with only the specific members of the family, not the family itself. This means that no matter which family member (roman, italic, etc) I choose, I will be losing for formatting already applied to the text. Please restore the ability to change the font without specifying a "style"/family member when choosing a typeface by typing its name into the font menu box. Thank you.

If this is unclear, please let me know, and I'll answer any questions.