For me, speed isn't the only issue. Everything about nc seems to be cobbled together in the most inconvenient way possible. Updates have always been hit or miss for me - and if you choose to use dockerized versions, you might as well shoot yourself, everything is very slow, even as the only use having it running on a quite capable machine it feels sluggish (not slow, but uncomfortably delayed).
It's a glorified Dropbox clone, why do I need anything more than a rpi1 for that?