I just wanted to reply this cannot be as Komoot is also using CH (fast routing algorithm using GraphHopper) but yes, they are relative slow for fast routes. The reason seems that they create a very big response (5MB) in these cases and then it takes more seconds to visualize this. For current & original GraphHopper the response is highly optimized and so it is much smaller (20x) even with comparable road data (like elevation, surface, bridges/tunnels and road class)

btw: in general Komoot is a nicely polished app. I can only recommend it :)