Electron as is, consumes relatively more resources than QT and it's obvious because uses Chromium under the scene. But this is not the only reason for a slow electron based program. Code is the most important thing in any application and it's the primary cause of bad performance. A well writen and optimized application will have a good performance, no matters on which platform is based (good ones, obviously). "Electron is slow" is like "Java is slow" right now. Do you want a probe of a well writen electron app? Check VS Code; it's fast, it have a good performance and consumes a lot less resources than Atom, for example.