I volunteered to work one summer in the technical services department processing a new branch library's collection. It was simple enough. Copy cataloging item records and pasting them into our catalog system. I must admit, I was quite good at it. Maybe too good.
Some of my fellow (and regular technical service) employees actually told me to "Slow down. You're making the rest of us look bad." Apparently, I was too adept at my task and was making the whole process take a lot less time than they had anticipated and they didn't want to go back to working on their usual assignments.