it can appear that your libraries are taking up more space than they are, thanks to the way hard links work.the libraries each link to a single copy of your photos, rather than storing each photo twice.if you had multiple iPhoto libraries (you would know if you did), you’ll need to copy them into Photos manually.
IPHOTO FOR MAC UPDATE UPGRADE
IPHOTO FOR MAC UPDATE HOW TO
Here’s how to delete iPhoto library and clear out some clutter.
With the upgrade to Photos, many Mac users have been left with a duplicate iPhoto library on their Macs.