Second Dynasty has laughably high system requirements for a game whose core theme has been with the Mac essentially since the beginning. On a 200MHz 604e that plays Myth II without a problem, the cursor stuttered every second or so as I moved it around. Compounding the issue of system requirements, which are high merely in an abstract sense, is that the minimum requirements for the Windows version are much lower, and the Windows version offers more functionality, specifically network play. I see nothing here that shouldn't run acceptably on my Centris 650 or a first-generation PowerMac 6100. All the slowness goes away.
Shanghai is ancient as far as computer games go.
As I mentioned earlier, I've been aware of it for 15 years or so. It's an enduring franchise, probably largely because it really doesn't require anything fancy in terms of a machine, and there will always be a market for puzzle games. Shanghai is all about matching tiles. As in any other solitaire game, winning is a combination of luck and forethought. First impressions are very important.