Run results for: Test: React useCallback vs notUseCallback

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser: Chrome 137

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

With useCallback

1.5M/s

Without useCallback

990K/s

View exact numbers

Test name	Executions per second
✓ With useCallback	1,546,779 Ops/sec
Without useCallback	989,866 Ops/sec

HTML Preparation code:

<!doctype html>
<html>
  <head>
    <title>This is the title of the webpage!</title>
  </head>
  <body>
  	<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.13.1/umd/react.production.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.13.1/umd/react-dom.production.min.js"></script>
	<div id="root"></div> 
  </body>
</html>

Script Preparation code:

function ComponentWithOutUseCallback() {
  const testFunction = (evt) => evt.preventDefault()
  return React.createElement('button', {onClick: testFunction}, 'Test click');
}

function ComponentWithUseCallback() {
  const testFunction = React.useCallback(evt => evt.preventDefault(), []);
  return React.createElement('button', {onClick: testFunction}, 'Test click');
}

Tests:

Without useCallback
ReactDOM.render(React.createElement(ComponentWithOutUseCallback), document.getElementById('root'))
With useCallback
ReactDOM.render(React.createElement(ComponentWithUseCallback), document.getElementById('root'))