Profiling Your Code: Finding Bottlenecks With Perf and Benchmarks
The C++ Programmer’s Mindset by Sam Morley (ISBN 978-1-83588-842-1)
You picked C++ partly for speed. Chapter 15 is Morley’s case for measuring before you touch anything. Premature optimization wastes time and adds complexity. Profiling tells you where speed actually matters and what is holding you back.