Oh. My. God. This is astoundingly better than any of the renders I've seen before. Is this a new feature?
There's an octoprint plugin called Arc Welder that's supposed to convert curves back to curves, which is supposed to make them print faster and cleaner, while keeping file sizes down. I've never tried it, and you'd think it'd be more of a standard feature if it worked as well as it implies, but the concept is pretty cool.