We've changed the OrbiterGen scripts today so that they can run one OrbiterGen per reported processor when you click "(quick) regen all" or "Regen All" in Web Admin. So, if you have two cores, two OrbiterGen processes will be started. If you have four cores, four OrbiterGen processes will be started.
There's no means right to say "run ALL of them at the same time, I need to heat the room up" right now from the website, but the scripts can take such a parameter. In the future, the scripts may be extended so that they start OrbiterGen on any Media Managers that have been declared powerful enough - but this would only make sense on MM with reasonably powerful CPU's ie better than Atom
Long story short, if you need to regen every orbiter in one shot, the "Regen all" buttons are optimal now (after you update your system of course).
As usual please run the updater script to get this update and any others that your system has not yet had applied.
Happy new year to all :-)