I'd like to say maybe the project assumes you have a strong beast of a computer & so is sending you the hardest work units to find cures...but I'm sure that's not it
I'm not familiar w/ Macs so I can't help..maybe we have a member that uses one that can assist?
Congrats on your new machine, Martin
I'm sure there's a reason & you'll find it.
... can always ask at WCG forums as well (in Boinc Support), if no one here figures it out
Edit: maybe ajeb