I just had that happen at my company. New Dev hired by the CEO without input from anyone else. She was not bad, but terribly sloooooooooooooooow. She indeed to

I just had that happen at my company. New Dev hired by the CEO without input from anyone else. She was not bad, but terribly sloooooooooooooooow. She indeed took 10x longer to do common tasks compared to other devs. It's not that she wasn't smart or reticent to learn new things, just that her way of working through problems was incredibly long winded for some reason. It's not something that you can easily re-train someone to fix, it's a fundamental problem and that combined with other issues made us let her go.