I organise my work just like KeithRJ, and so, I would like to have the possibility he evoked to choose one catalogue at the opening.
Some of my catalogs are heavy, so PM+ works for sometimes 20-30 seconds at the opening before I could use it*. (at this time it's a catalog of ±25000 D800 Raw images for exemple).
Yes, I'm reflecting to do differently, but if I could save an amount of reflexion + hours of work keeping near 20 years of habit and archives structure (with iView at the beginning!), I would be very very pleased!!
*iMac 27" mid-2011 with Mac OS 10.13 and 16Go Ram