Benchmark: Comparaison querySelector vs getElementById vs getElementsByClassName

Comparaison querySelector vs getElementById vs getElementsByClassName (version: 1)

Benchmark de performance des sélecteurs DOM natifs en JavaScript : comparaison entre querySelector, getElementById et getElementsByClassName sur 2000 éléments.

Comparing performance of: `getElementById vs querySelector #id vs getElementsByClassName vs querySelectorAll .class vs querySelector .class vs getElementsByClassName[0]`

Created: 2 months ago by: Registered User

Go to the latest result

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

var container = document.createElement('div')
  for (var i = 0; i < 2000; i++) {
    var el = document.createElement('div')
    el.className = 'bench-item'
    if (i === 1000) {
      el.id = 'target'
      el.classList.add('target-class')
    }
    container.appendChild(el)
  }
  document.body.appendChild(container)

Tests:

getElementById
document.getElementById('target')
querySelector #id
document.querySelector('#target')
getElementsByClassName
document.getElementsByClassName('bench-item')
querySelectorAll .class
document.querySelectorAll('.bench-item')
querySelector .class
document.querySelector('.bench-item')
getElementsByClassName[0]
document.getElementsByClassName('bench-item')[0]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
getElementById
querySelector #id
getElementsByClassName
querySelectorAll .class
querySelector .class
getElementsByClassName[0]

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36

Browser/OS: Chrome 146 on Windows

View result in a separate tab

getElementById

11.8M/s

getElementsByClassName

11.5M/s

querySelector .class

7.8M/s

getElementsByClassName[0]

7.7M/s

querySelector #id

49K/s

querySelectorAll .class

31K/s

View exact numbers

Test name	Executions per second
✓ getElementById	11,800,223 Ops/sec
getElementsByClassName	11,470,718 Ops/sec
querySelector .class	7,814,402 Ops/sec
getElementsByClassName[0]	7,694,284 Ops/sec
querySelector #id	49,241 Ops/sec
querySelectorAll .class	30,514 Ops/sec