On what basis does the Finder update the file copy progression bar? I want to know that the progression of the progress bar in OS X is based on which factors by the Finder?


Time (passing or estimated)
Number of files remaining
Size of files remaining


If possible, can we change the factor used in any way to match our choice?
To make a somewhat educated guess


The bar shows "time spent" vs. "overall time expected"
"overall time expected" is somewhat dynamic, depending on current throughput. So if you start of with a lot of small files (which usually take longer than a large one) transfer seems to speed up later (and vice versa)
I'm not aware of any way to change this


PS: And no, I don't have a reference for that, just years of observation