static get defaultOptions() {
    return {
      // see https://www.desmos.com/calculator/ynl8fzh1wd
      // <500ms ~= 100, >1.3s is yellow, >3.5s is red
      p10: 1282,
      median: 3500,
      thresholdInMs: 50,
    };
  }
@return {LH.Audit.ScoreOptions & {thresholdInMs: number}}