I opened a old V3 P5 pz3 file which had a bunch of V3 morphs loaded - the file size was 41 mb. And when I saved it in P6 it reduced the filesize to 3 mb! Wow! I imagine it's from P6's ability to save morphs externally. What a space saver! I guess this is also what makes P6 save files so much faster than P5 could.