Memory Profiling

The knowledge that you obtain from these tools is, most of the time, much more impactful than just the immediate optimization that you might happen to do. It's not very fast by itself, so it's not meant to be measuring like, millions of nested objects, cuabites of space. But certainly it's very helpful to know when you're making a deliberate decision to use something may be less sufficient then when you might want to just drop down to, say, a javerra or something else.