Refresh rate does kind of matter. 1Hz imposes an average 0.5s latency on any update, which would be obnoxious in some situations.

Quite normal on most bike computers already with a slow refresh, even if they're able to refresh faster. You can't really read a number if it keeps changing all the time.

> 0.5s latency on any update, which would be obnoxious in some situations.

What situation?

i can push it as high as 20Hz.

For me, it matters only when I'm futzing with the map: dragging around or zooming. For the rest of the info on the display, anything more than 500ms interval seems like a waste of power.