Had to reinstall Unity to fix a build issue on a contract project and it decided that everything needing reimporting... again. I'm now an hour into a multi-hour build while Unity consistently sips much less than half of my available CPU cycles. They really really really need to import assets in parallel. Multi-core CPUs have been a thing for _so_ long at this point. :( Since the editor runs the build, you can't even do *anything* else while it runs.