The “doing nothing” step is usually the case where single thread is maxed out. So depending what kind of status you’ll use to monitor what the system is doing, it might look like doing nothing. Yet it’s working on “full speed”. With larger data sets like yours, that can take a week or longer. Also the CPU performance naturally affects that a lot. - At least that’s my personal experience in several different environments. With latest canary with Windows & Linux platforms.