next.js/bench/pages/stateless-big.js

import React from 'react'

export default () => {
  return (
    <ul>
      {items()}
    </ul>
  )
}

const items = () => {
  var out = new Array(10000)
  for (let i = 0; i < out.length; i++) {
    out[i] = <li key={i}>This is row {i + 1}</li>
  }
  return out
}