The difference is that the lua runtime is embedded (and wicked fast) into Neovim vs nodejs that has to go over the remote plugin interface

Fair enough. I've been using coc for a while now and can't say I've ever had any speed issues that I've noticed. But if the neocvm language server is built in and "as good" as CoC then that'll be one less plugin I'll need to install when it's ready.

Yeah I don't have any node.js speed concerns for it, I just would like to have the simplest editor microservice architecture, and putting the client to a service in a service was a bridge further than I wanted.