I invite you to find any ethics board in the world that would speak out against "I made my company $10MM more yearly by causing the page to load 3 seconds slower for all of our users, with janky scrolling and popup ads". I mean, frankly, that's a very utilitarian calculation—think about just the simple case of a business saving money by removing their caching layer. Who is to say how many seconds of performance deoptimization is worth how many dollars of saved cost? If it only cost users 0.1 seconds in the median case and 1 seconds in the 95th percentile case, and you saved $1MM yearly, would you make that call?