I am running Zwift on my iphone SE. It is very stable.
The last two weeks I have been using a lightning to HDMI converter and the FPS is not as high out from the converter as on the iphone screen.
I estimate the converter FPS to about 15-20.
Is it possible to change FPS (and also the resolution)settings in the app?
Or is the converter the limiting factor? It claims to be able to handle res.1080
and FPS 60.