Thanks a lot for your help!
I was about to let the boards sleep in a drawer until they are supported…
Like often, the doc is mostly there, but scattered all over the place, addressing several versions, and someone like you with a global view of the arch is needed to have all the pieces fall in place…
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I activated the perf monitor with the custom esp tick from here Show CPU usage and FPS count - #6 by Meekdai
It says 30 FPS with nothing animated, 25 FPS and 19% CPU with an LVGL spinner.
As expected, screen shakes a bit when a CPU intensive task is run.