If you care about performance in your debug build, GCC has a special option for that: -Og Changelog: "A new general optimization level, -Og, has been introduce

If you care about performance in your debug build, GCC has a special option for that: -Og Changelog: "A new general optimization level, -Og, has been introduced. It addresses the need for fast compilation and a superior debugging experience while providing a reasonable level of run-time performance. Overall experience for development should be better than the default optimization level -O0. "