3 ms·Unless it's a short-lived CPU intensive task, in which case in matters a great deal.by andrewvc 11y agoUnless it's a short-lived CPU intensive task, in which case in matters a great deal.otterley 11y agoThe overhead of fork() is negligible, well under 0.1ms.andrewvc 11y agoThere's also the issue, in ruby, that CoW doesn't really work due to the fact that the GC dirties all pages.mperham 11y agoThis was fixed in Ruby 2.0.