md-benchmark.js

var x1 = 'aaaaa\nbbbb\ncccc\n\nddd'
var y1 = ''
for (let i = 0; i < 100000; i++) {
  y1 = y1 + x1
}

const markAll = () => {
  const t0 = new Date().valueOf()
	marked(y1, {
    gfm: true,
    breaks: true
  })
  const t1 = new Date().valueOf()
  console.info(t1 - t0)
}


const markEach = () => {
	const t0 = new Date().valueOf()
  var xArr = y1.split('\n\n')
  xArr.forEach(line => {
    const html = marked(line, {
      gfm: true,
      breaks: true
    })
  })
  const t1 = new Date().valueOf()
  console.info(t1 - t0)
}

markAll()
markEach()