The context of this sign being in a sushi restaurant would be the key here. In higher-end, "omakase" sushi restaurants, you'll be served a set of sushi piece by piece as the chef makes it in front of you. Typically you'll want to eat it as soon as it is placed on your plate.

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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It could be leftover credit that people are using up. There's a fair bit of it floating around, giving awards used to give points too so it's hard to say if anyone actually gave them money to give the gold.

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