An Amiga 3000 with the original 25 MHz m68030 / m68882 is barely functional, but I can ssh with it, I can load modern SSL sites, I can write, print, et cetera.
An Amiga with an accelerator and m68060 is comfortable, and it actually snappier than most modern Windows systems.
An Amiga with a PiStorm makes modern computers feel sluggish and drowsy. It's not easy to explain, but there's an immediate response to practically everything that's not from a floppy (although it's amazing how quickly things load) and isn't loading over the Internet (can't help the speed of light).
The more I play with these systems, the less I want to run a modern GUI OS. Give me the AmigaDOS GUI on a NetBSD machine, and I'll consider using a new machine.