I use android auto in numerous rental cars. Some head units are so slow to process taps or menu selections that it is pretty much unusable.

The normal headunit UI is generally ok, so either there’s a whole lot of overhead for android auto, or some programmer simply dropped the base example implementation of it into the system and did zero work at optimising it.

Personally, I’m betting that it’s the latter. “Supports Android Auto” box has been ticked on the feature sheet, send it.