Ask HN: How do I become more productive as a programmer?

I'm a mediocre programmer in my early 30's with 10+ years of web development under my belt and a senior title. When I was younger and more junior, my rate of development was never a problem. As I get older, I've noticed that the rate at which I spit out code has slowed down. I think through tasks a bit more thoroughly now and do more prep work before coding. I believe the solutions I come up with are better, faster and easier to maintain than anything I came up with in my youth. But, all management sees is that it takes me longer to finish an equivalent task than the rest of my peers.

Is this something I need to work on to be competitive in my field? Or is this a case of companies trying to squeeze more value out of their employees? And if I do need to increase my rate of development, what's the best way to do that?