> >Unexpectedly I was always in MacX even though it wasn't doing > >anything (not even any windows open). After quitting MacX and all the > >other apps except the Finder 5.0.7r1m got much faster about the same as > >4.1.8. Is the 5.0.7r1m MPW tool yielding way, way too frequently? > > 5.0.7r1m calls SpinCursor 12 times a second. I'm not quite sure into how > many WaitNextEvents this translates. It seems to me that MacX might be > stealing way, way too many cycles. Yes, I can confirm this. MacX 1.5 vs perl5, perl5 loses. Didn't try the old perl though. I have not had any other problems with other apps abusing perl. --ed ps: on my 7100/80, your code ran in 29 secs. --ed