The GPU in my laptop (Lenovo P16) is an RTX A4500. I just loaded a very detailed figure with about 5 million triangles. Prepare pane is a little choppy (4K resolution dual monitors) with this model. Preview was quite freewheeling.
GPU load when minimized appears to be higher than if static full-screen … but two instances with 12 million triangles … you’re asking a lot of your system.