Electron apps have exactly the same performance as web apps, which is what its aimed at. Badly performing code can be written in any language; you'd be surprised at how much mediocre C++ code is running on your desktop. You're also running insane amounts of mediocre C# applications.

Comparing Electron to AIR makes no sense, they're radically different runtimes with radically different ecosystems. AIR stands alone while Electron reuses the web stack already used by millions of developers.

I find it rather elitist to dismiss Electron apps as "easier" to build or having users suffer. Thats completely false and grossly overlooks the context in which these apps were built. This is the kind of comment you'd expect from a beginner without much experience wanting everything to be in his favourite language.