Or for advanced situations "selectively efficient" - using something other than Electron for an app that is intended to be cross-platform because [insert-alternative-here] is smaller/faster/other may be an example of premature optimisation and using something else (especially where that involves learning something else) could mean trading off elsewhere.
Or for advanced situations "selectively efficient" - using something other than Electron for an app that is intended to be cross-platform because [insert-alternative-here] is smaller/faster/other may be an example of premature optimisation and using something else (especially where that involves learning something else) could mean trading off elsewhere.