Ask HN: asking for a pay raise and trying not to damage team morale

For a reasonable period of time (a couple of months or more) my efficiency is two or three times higher than my peer's (it takes me 2-3 times less time to do extremely similar tasks, we work as programmers) and we get the same hourly rate from the day one. How to ask the manager (lead developer who is like a middle man between us and founders) and maybe then founders about pay raise based on the efficiency? Because I simply can hardly find motivation to put more efforts. But at the same time I do not want to damage team morale because we are just 4 employers + 2 co-founders. And no, I do not try to do everything ASAP, I just do my normal work.