How can I measure and diagnose Awk script performance using timing and profiling techniques?

Measuring Awk script performance involves capturing execution time with tools like time or bash built‑ins, and optionally using profiling features such as gawk’s --profile to identify hot spots. Still, it is unclear which timing approach yields the most reliable real‑time measurement for short‑running scripts, how to interpret the profile output in terms of specific language constructs, and what statistical treatment of multiple runs is needed to distinguish genuine improvements from random variation.

Which timing method—external time command, shell built‑in, or internal EREPORT—provides consistent results for Awk scripts under varying loads? How does the --profile output map to individual patterns, loops, or function calls, and what thresholds indicate a performance bottleneck? What statistical techniques, such as calculating median or confidence intervals, should be applied to repeated runs to ensure observed differences are significant?