Depends on the type of model it is, a lot of the time. Anime egirl/eboy-styled avatars tend to be some of the worst offenders (often kitbashers who don't know any better), while furry avatars tend to be really well optimized most of the time.

If you aim for medium, that's generally sufficient.

F is the eighth letter, "of"

It certainly doesn't subtract from the experience, that's for sure.

I hate to tell you this, but the previous one was, too.

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Typically needs to be magically-infused calcite chalk for that traditional feeling that your new demon friend will appreciate and respect you for. If you can't infuse the chalk yourself, store bought is fine but you might end up with unexpected results based on the source.

As a note for Jerboa users: the above link may instantly crash the app. At least, it does for me.

I'm of the opinion that it has a time and a place, but I do agree that it's exceptionally intrusive to the site's normal experience and should be very rare and short-lived. Any more than a day and its runs afoul of the people who just aren't interested.

Not literally take over a subreddit, takeover advertising campaigns are typically a high-key screen space domination type of advertising. Think of something like a video games news site where the homepage is completely covered in advertising for a new, high budget game. Ads at the top, ads at the bottom, ads in the normally-empty margins, and often a focus on articles about the subject.

How that reflects to Reddit I'd never know, it's likely something that's exclusive to the newer layout that I have no interest in using.