You probably don't need Oh My Zsh | Artem Golubin

Oh My Zsh is cool but I've always veered away from it because of the huge footprint. This post addresses that directly with recommendations to get the biggest value with the least performance hit. I would also add that your shell is probably something where you should really know what is happening, and turning it over to a bunch of stuff you aren't familiar with is perhaps not the best idea.