Function fmtUs

benchmarks/report_changelog.mjs:77–84

(ms)

// thousands with a comma — a single unit reads more honestly than ms, where the
// fastest cells collapse to "0.00".
function fmtUs(ms) {
  if (ms == null) return NONE;
  const us = ms * 1000;
  if (us < 10) return us.toFixed(1);
  return Math.round(us)
    .toString()
    .replace(/\B(?=(\d{3})+(?!\d))/g, ',');
}

// A speedup factor for the symbolic table (Mathematica time ÷ engine time).
// Higher is better; Mathematica itself is 1×. Values < 1 (engine slower than