Someone, who seems to have some personal knowledge of Snow Leopard, claims to have solved the mystery of Snow Leopard’s shrinking mail.app.

In a post that details the various myths doing the rounds on the shrinking apps—no PPC code (false!), smaller binaries (false!), missing language files (false!)—the writer spills the beans:

When you look in Mail.app you see that language files use up most of the disc space. Inside the language folder (e.g. “German.lproj”) are a lot of .nib files (the extension of Interface Builder). Inside normally are two files. One is a very small “keyedobjects.nib” and the other is very big “designable.nib” file… Now the “designable.nib” is gone. It seems like it had no reason other than to give hackers a chance to mess with the application’s UI design.

I guess he is referring to these two files which are inside each (c. 84) folder within every (18) lproj localisation folder, as in this example from the English.lproj GeneralPreferences.nib folder:

Perhaps this is as false an explanation as all the others.

Still, it has enough specifics, specifics that only someone with access to a build of Snow Leopard could know, to lend the story credence.

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UPDATE: A post today claims to explain it all.

According to a post on AppleInsider , the apps in Snow Leopard are going to be dramatically smaller and more efficient.

This weight-loss regime is prompted by the need to slim Mac OS X down for the growing number of mobile devices, so RoughlyDrafted (the source of the AppleInsider report) suggests.

As the graphic below demonstrates, the new apps are significantly smaller; Mail.app alone loses 196MB, over 68% of its current size:

Who would have thought that Mail.app had so much weight to lose?

According to AppleInsider some of the efficiency comes from a greater centralisation of resources in Snow Leopard:

Among the technologies believed to be aiding the downsizing are Resolution Independence, which substitutes bitmapped raster graphics with smaller vector graphics files, and Localization, which extracts the plethora of localized language files from each individual application and instills them into a centralized container accessible to each application.

Mail.app users can also look forward to more complete text handling features like auto word correction, smart dash insertion and more.

Related posts

• Snow Leopard’s shrinking mail.app: Mystery solved
• Security Bug back for Leopard Mail
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• Leopard Mail development continues behind (mostly) closed doors
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