It's a dismissive answer. It'd be like if someone asked "why does 0.2f + 0.1f print 0.30000000001?" and getting back an answer of "use a debugger!" It's not str

It's a dismissive answer. It'd be like if someone asked "why does 0.2f + 0.1f print 0.30000000001?" and getting back an answer of "use a debugger!" It's not strictly wrong, the debugger would provide you with the data on what's happening. But it doesn't actually answer the question or provide commentary on why. Similarly, the "profile it!" answer is often used when the person answering doesn't actually know themselves, and is just shutting down the discussion without meaningfully contributing. And it doesn't provide any commentary on why something performs like it does or if the cost is reasonable.