Have you ever used facebook.com? At least the frontend is incredibly slow (on a thousands of € machine), so that's not synonym with quality in my experience.
From reading the comment thread I would say the front end would be macro, local would be like a specific function on the front end, like the friends list, that by itself could have "good code".
Like when I have a red number indicating I have a notification and then I click and it just loops forever on some grey animation because it doesn't manage to load the list of notification on my fiber connection?
You're thinking of features when the other person is thinking in code. Maybe some overcomplicated bloat is involved with whatever goes into clicking that.
They mean locally as in code scope and not necessarily client sided or the size of a feature
