File compression

At least Windows OS and Mac OS offers on-the-fly compression of files. On the fly compression is not same as compression using file compression utilities, it has lower compression ration, but it is fast.

At least in Windows OS compressed files and folders are shown with a different color in file explorer, so a user will know that these files are compressed.

It takes slightly longer to open a compressed file than uncompressed because this file needs to be decomposed first before the content of such a file is available to the user.

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