The demo runs pretty well on my 2020 Apple M1 MacBook Pro (not the Pro or Max version of the M1) in a window, but full screen on my external monitor and it starts to look like a slideshow - although the screen's resolution is 5120 × 2880 so maybe that’s not too surprising.
Viewing post in Ella - a study in realism comments
Thanks for watching. Yes, it is a high end demo and designed more for desktop graphics cards. It should run at 60 fps at 1080p on a GTX 1060 or RX 580.
Slower machines can work, but not at high resolution. With your screen, even on lowest settings 50% render scale, it's still pushing 1440p, which would need something more like an RX 5700 XT or RTX 2070 Super to get 60 fps.
Because I realized this, I made the default window size smaller (1600 x 900) that way more people could at least see the demo on a variety of machines, though only in a window.