A customer came to me with their MacBook Air (first Gen) with a 75GB SDD. It only had 1GB free space on the internal HD and would not run Apple Software Updates. Software Update would claim that there was not enough free space and 2.9GB was needed.
Monolingual removed all language files (other than English), keyboard layouts, and processor architecture. Supposedly it not only saves HDD space but also speeds up OSX through optimization.
When running Monolingual, it is important to choose Remove on each tab (Languages, Input Menu, Architecture) individually. When I hit Remove after choosing all languanges, but was on the Input Menu, it told me I saved 60Mb. Wow, not great… But then I realized if I hit remove on the Language tab, it removed about 3 GB of data from the Macintosh HD and the Monolingual app took much longer to run. Removing architectures (all but Intel and Intel 64bit) resulted in recovering 786M of space.
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