While you're technically correct, it's probably unlikely performance is going to matter for these types of mass updates. As long as performance isn't atrocious,

While you're technically correct, it's probably unlikely performance is going to matter for these types of mass updates. As long as performance isn't atrocious, theres one-time updates will be "fast enough". Typically, these get run during off-peak hours. This running in 30 minutes vs 12 hours simply isn't important.