+1. I completely feel that and I definitely slacked more when employed by someone else doing something boring.

I was similarly surprised by hearing great things about me and how fast things get done (man, I did 10x the work for my own startup in the same time), but I think it boils down more to interpersonal skills, chatting on slack and showing my knowledge, solving problems quickly in the presence of others. People's feedback is not a good metric to estimate how much work gets done.

At the same time I can work hours straight with no distraction if I enjoy the problem or if I'm working on my business.