Javascript actually can perform well, not nearly as well as java can, but it doesn't have to be as bad as what you see on most electron applications. But it's not trivial to make it so.
But I'd put javascript and java on the same cohort when talk about usability (programability?, what name do I use here?). They are not as bad to be dangerous, but neither is any good either. Anyway, the JVM allows some other languages that don't solve all the problems but bring you some expressivity (honestly, I have no idea if this is a positive), while electron can work with typescript (much better than javascript) and can run wasm (what currently implies on rust, what means low expressivity but high confidence on your code).
I'm not ready to declare any winner here.