I will slap the shit out of the space key to skip dialogue if it is with a character that I don't care about, or if they are giving exposition about a plot element I find annoying or irrelevant.
For example, say you're playing a Russian VN. You can almost guarantee it will have a storyline about a crime gang, having to plan and commit a robbery, or dealing with a conspiracy involving corrupt law enforcement. I will skip past that shit in a heartbeat because it is so boring and irrelevant.
If you're playing an American VN with a gamer-girl little sister you will have some plot about a gaming competition or even a international tournament. I'm skipping past that at light speed because it is irrelevant and cringe.
However, if it is about the LIs and the relationship between them and the protag I will read it.