I know it shouldn't work this way: but my shiny new #Viewfinity #S9 exhibits an order of magnitude less latency over DisplayPort than Thunderbolt from my #Framework laptop.
I'm told there is a BIOS update for the laptop, but it just works so I'm gonna leave it. No such quirk from the #MacBookAir.
Contrary to the opinion of random people on the Internet, #5K displays work perfectly well over mini-DisplayPort (1.4).