Discussion on question by softwaredev1: Unable to focus on programming around 3-4 PM every day. How can I fix this?

I would venture that 6 hours of straight coding is more than most people are able to pull off anyway. You're not a robot.

So you're a high performer and get excellent reviews but your manager is saying that's still not good enough? Have they been specific about how much work it would take to make them happy?

Programming is creative work, and creativity doesn't answer to a schedule. While you can promote it with a good environment and habits, it's still not a switch you can flip on and off. Accept that midafternoon is not a productive period for you, and listen to your body when it tells you to take a break. No one goes 100% all day in software.