I don’t see the dilemma - if you want to appear 50% more productive, why not actually be 50% more productive too?

Or do you mean being more productive doesn’t automatically translate to it being visible.. yeah that is a tricky one..

That guy that doesn't even show up might be just playing videogames... Or maybe taking credit for your work over a coffee with the boss of your boss

Unless further elaborated, why would one assume that being 50% more productive will not appear as being 50% more productive?

Real world experience.