> Rather than doing it every 1000 iterations, make it be time-based.

Yes, I agree with you there.  That's what I myself usually do in fact.

> I'm not sure what you're referring to when you talk about "other
> techniques", but in general it is forbidden to access the GUI of a
> Cocoa app from secondary threads, so you pretty much have to use
> performSelectorOnMainThread: or some equivalent to update your GUI.

I was referring to where the OP said:

"but would it be safe, given the fact that sum and count are bound to some 
textFields/progressIndicator"

And presumably it would not be as the instance variables referred to were 
being mutated in a secondary thread.  Not my area of expertise though, I 
have to say.  Not in Cocoa anyway.  I am used to a more robust threading 
model. 

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