Agreed, it's quite an inspiration as to the best Electron can be. I think the trick for an app like ours is to offload the heaviest pieces to native code, and use Electron purely as a presentation layer. This is something we're now going to look into.
While reading this[1] I just remembered you guys and thought I'd throw in the idea of compiling your "native" code to WebAssembly, in case it might fit your case.