Actually, earlier today Electron 2.0.0 dropped and includes an `affinity` option, which throws everything under one process. Supposed to help with memory/resource usage.
I think it'll be hard because they depend on Chromium for performance, which is practically out of their hands and the project is already very streamlined for what it's doing. But Electron comes with a different set of tools i.e. you have the full browser API and renderer at your disposal.