>Does the Electron team have a focus on improving performance? Or is the issue with the developers using electron, should they be optimizing better?

I think the main issue is the developers, some apps don't use so much memory where others seem to use too much for the features they provide, IMO most JS developers do not understand how GC works and how you can by mistake keep objects alive.

There is also the issue where you do not have a default UI toolkit and some frameworks like angular are bad for performance(I mean how in angular codes I seen data binding trigger tons of unnecessary updates but maybe some will blame the developers using it wrong)