te');
  next();
}

function changeStart(next) {
  for (let id = 0; id < RANGE_START; id++)
    list[id] = {id, text: `R${Math.random()}`};
  console.time('change-start');
  $(document.body, ul);
  console.timeEnd('change-start');
  next();
}

function changeMiddle(next) {
  for (let id = RANGE_START; id < RANGE_END; id++)
    list[id] = {id, text: `R${Math.random()}`};
  console.time('change-middle');
  $(document.body, ul);
  console.timeEnd('change-middle');
  next();
}

function changeEnd(next) {
  for (