If the one realm was small, it may not make enough difference to notice at the GB level.
I noticed while working with Imports that importing relatively small amounts of data (originally exported from my own database) caused the database file to grow to many times the actual needed size (8x, 10x, 16x). Compressing the database recovers this "empty" space. (So my 1.5 GB realm that had grown to 8.5 GB through export-and-re-import was shrunk back to around 1.5 GB again.)
The developers have noted in the release notes that this is primarily a work-around for the import size growth issue while they work on a more permanent solution.
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