File / Folder size... How do Finder gets it?

Hi there!
While checking some of my hardrives for sucessfull shell script execution backups, i noticed that Finder took a loooot of time to provide the info about the Folder / File size on the Information window, while a simple ls -l could provide on the fly values regarding file or folder size, as always, fast simple and faithfull unix mindset!
Well, that makes me wonder, how does Finder calculates those values? Anyone got an hint?
Does it make it all by himself, if so. WHY? Been an "posix" system, shouldn't he be using whats already provided by its *nix heritage?
In this case, the value is already there, why don't use it and simply parse it to the desired format (MB / GB / TB)?
Maybe this could be only one of several features (GUI) that could improve it's performance from being more "conscious" of the system natively provided "toolkit".
Please, this is only my humble thouhgts on this, and please do shut me up if totally wrong!
Hope to get some nice and interesting feedback from the OS X community!
If there's a better spot to start this kind of discussion, please do mention it, i will appreciate it!
Best regards.

Properties. Short Cuts, Change Icon resolved the issue after restarting. Problem resolved.. Thank you for all the help Dwain

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