Intel VTune's microarchitecture-exploration mode is how game studios and HFT firms diagnose whether a hot loop is frontend-stalled or backend-stalled on Skylake-class cores, a level of detail perf's default counters don't expose. AMD uProf gives the equivalent CPI and cache-hit breakdown for Zen chips, and real teams have shipped 30%+ latency wins, like the video-encoder example here, purely from acting on what these profilers reveal.