Large Photos Library Mac
Mar 18, 2020 Here's how to open one of the multiple photo libraries that you might have on your Mac or on a connected external drive: Press and hold the Option key as you open the Photos app. Select the library that you want to open, then click Choose Library. Photos uses this library until you open a different one using the same steps. Apr 22, 2015 A large library like mine, however, can still be a drag on the Photos app, slowing down performance to the point where a quick edit in theory becomes frustratingly laborious in practice. ICloud Photos lets you have your picture of a cake and shoot a video of eating it, too. You can create a library of images and movies that’s far larger than the storage space available on any.
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1) Should a library of 54,100 photos be 222GB in size? I have seen other references online that have half the photos and the library is 20% of the size, etc. Does this ratio seem accurate or is something else going on?
It will depend on the pixel size of the individual photos, but my library has roughly 50000 photos and a size of 249.8 GB. So the size of your library is normal. My library is working fine. If others are having a much smaller library for the same amount of photos, they may be storing their photos as highly compressed jpegs or in a low quality.
2) Is there any benefit to running the repair utility again now that I have a 'new' Mac? Or is the problem likely in the old library regardless of where it's stored?

I would only run a Repair, if photos cannot find some photos, albums vanish , or similar problems that indicate a library corruption. Never run a repair without making a backup before you run the repair. If a library is damaged, a repair can make the problem worse.
3) I plan on purchasing one of the de-duplicate utilities that exist as I know there are some older photos that are duplicates (and probably a number of HDR duplicates as well), and they should all be cleaned up.
Photos Library Mac
You may try to use third-party applications to remove duplicates, but stay away from from any program that will modify the Photos Library directly and not just collect the duplicates in an album. The duplicate cleaners that modify the library can damage the library beyond repair. Apple is warning about duplicate cleaners:
These applications are save:
- Power Photos - it can exact duplicates or photos with the same filename or capture time, and is generally a great companion to Photos as a second browser
 - Photo Sweeper - It can detect edited versions of the same photo by comparing bitmaps and histograms
 - Duplicate Annihilator - it ca detect exact duplicate files.
 

Mac Photo Library Management
4) What is the best course of action for managing a large Photos library? Would using Aperature (as opposed to Photos) help?
Aperture is great, but no longer sold. And Photos should be able to cope with even larger libraries than you are using now.
If you want to split your library, it will make it easier to backup the library and copy it to other drives, but make it harder to use your photos, because you would have to switch between libraries. You can only have one library open at a time and searching across libraries is not possible.
Large Photos Library Mac Torrent
The slowness you are noticing may be caused by the small RAM. 4GB of RAM is not much for working with large media files. Can your iMac be upgraded to more RAM?