How fast?

I've now had my wife's new iMac collecting, in Mathematica, Ruth-Aaron numbers (greater than 100 billion) for one full week. In that period of time, it has looked at some 10.5 billion candidates — roughly one million every minute. This is more than four times the rate that I have been getting on my old Mac — in a range where the numbers are five times the size. So, I could reach 100 billion (from my current position of 24.5 billion) by mid-March (at the latest) if I were to transfer the job to my wife's iMac today. Instead, I will let her computer continue its current compilation for another two weeks.