Mac Performance: pretty spritely these days with a solid graphics card and lots of memory and images which are 36 MB and smaller. D850 and 5DSR images have always been much slower for me. For best speed in workflow, don’t turn on noise reduction at all until right before processing (except for previewing/testing noise reduction on a couple of sample images).
I second everyone’s comments about Apple Photos. Treat that application like the plague as it will destroy any workflow you attempt to build with its flaky database and it’s ability to lose or ruin originals. Metadata, particularly ratings, cannot be reliably exported from Apple Photos.
I would advise you to use the Apple folder and file system as part of your core DAM process. It’s very reliable. Don’t bother with Finder Tags as support comes and goes from them and they have historically been very fragile. XMP sidecars with metadata are far more reliable.
Triage applications which support XMP sidecards include FastRawViewer ($15), ApolloOne ($30), Photo Mechanic ($130). Photo Mechanic Plus ($230) will also create and manage catalogues which are incredibly fast to filter and search even when huge (7 TB of images). Using finders and folder structure to manage finished images can work though.
I have written in considerable detail about workflow in Photolab on MacOS, based on my posts here on workflow, DAM and triage.