Kind of a coincidence that you should bring that up since several jobs I've been at involved stints analyzing performance and identifying bottlenecks in existin

Kind of a coincidence that you should bring that up since several jobs I've been at involved stints analyzing performance and identifying bottlenecks in existing code and it is, unfortunately, rather easy to glue together even well designed libraries in ways that result in a slow, inefficient result. Developers simply cannot get away with not knowing how their tools and libraries work under the hood.