If you're running Pro Pack or later, there's a Python script to compress all your obj/cr2/hr2/pp2/pz2/cm2/fc2/hd2/lt2/ files in Runtime:Python:poserScripts:Utility.

Although I'm not sure it works on pz3 files, or just the "internal" files in poser.

Also, if you do any sort of editting of the files (like using a text editor to change something in a cr2) you'll need to decompress the files in order to do that.

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If you're joking that's just cruel, but if you're being sarcastic, that's even worse.