Scraping time – what affects it?

I’m trying to streamline my library to reduce update times, but I don’t really know what affects it. I’m putting all TV shows in a single folder per show name, but for some of them I have an “Extras” folder that has extra videos, artwork, or information that I want to keep, and keep with the TV show, but that Kodi never will (or will need to) be able to scrape from the web. Is Koki spending time on them every time a library update is performed?