Lrcat files much smaller in LR6???

Should I be worried?
My LR preview files are substantially smaller after the LR update/conversion. Just flipping through them, I can't find any problem but is this size reduction "normal" and are you all seeing it?
Just fyi, I have about 160k files and they preview size went from 4.2gb to 3.4 gb - the lrcat file is exactly the same (1.7 gb)
I've run a folder sync on all the folders and stuff looks fine but I can't say I'm not a little worried..well I won't lose any files but don't want to recreate previews for a week :-)
Thanks
Tom

I think what is going on is explained by the "quick import" new feature...that the previews are made later in the background.
I have my LRCAT files stored in dropbox. I just opened LR on my macbook and see that some of the files do not have previews. I think they will eventually get them if I let the iMac run (which is connected to the external HDD where the image files are stored).
I guess this is a problem for me - I do not see any way to tell when all of the previews are created. It seems the moving bar in the menu of LR is complete but the previews are not there.
think I might need to create new previews for the whole catalog...not a nice prospect so I hope I'm wrong...
Thanks,
Tom

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Lrcat files much smaller in LR6???

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