This bugs me to no end about Electron. The one module that existed to implement cross window / process communication is deprecated with no alternative. I haven't found a solution for multithreading in electron without killing the base process (which they explicitly say NOT to do compute in) or the rendering process (duh).
Web workers launched from the renderer work fairly well if you just need compute. I think I've also seen some apps add an additional BrowserWindow that's never displayed onscreen, although that will increase your memory overhead.
