Outside of professionals and core contributors who write performance critical C, most folks haven't done a whole lot of work with a profiler with C programs. One doesn't get performance for free. It's paid for in some way, shape or form. The only thing that's up for grabs is how and when you pay for it. The costliest form of payment is developer hours, which you try not to pay if you can avoid it, though you sometimes can't avoid it.