showspeed OSD assumes 1qu = 1in
The OSD in the bottom right shows in/s instead of qu/s when showspeed is 1.
1qu might be 1in in Quake, but the ingame scale varies by game and by map.
1qu is not 1in in Xonotic and the scale of a player can be adjusted with cvars...
showspeed is "0" ["0"] (also cl_showspeed) shows your current speed (qu per second); number selects unit: 1 = qu/s, 2 = m/s, 3 = km/h, 4 = mph, 5 = knots