Hey @ronald,
JM is going beyond the default options for the Prompt With List action, and I think that's adding a little time to the macro.
He's also AppleScripting the Finder, and that's addling a little more time.
I haven't examined everything carefully for all possible bottlenecks...
My macro is using find in the shell and sed to maximize the speed of getting the file paths.
It's not quite as fancy and JM's, but the speed is worth it (to me).
I have the old 2010 MacBook Pro and a 2012 MacBook Air.
I desperately need some new hardware, but with the M1 Macs out now it's pointless to spend money – when I can get by for a while.
It does chafe though...
I'm thinking the 5K iMac M1 version will be where I want to go, but I'm not sure yet. It depends upon what Apple surprises us with and what their release schedule is.
I'm tempted to buy a M1 Mac Mini, but I'd have to have extra RAM, HD, and an external monitor – so the expense it too high right now.
-Chris