Run results for: With or without useMemo

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Without useMemo	770149.9 Ops/sec
With useMemo	952626.2 Ops/sec

HTML Preparation code:

<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>

Script Preparation code:

function ComponentWithInlineFunction() {
    const clickMe = () => {};
    return React.createElement('button', {
        onClick: clickMe
    }, 'Click me!');
}

function ComponentWithUseCallback() {
    const clickMe = React.useCallback(() => {}, []);
    return React.createElement('button', {
        onClick: clickMe
    }, 'Click me!');
}

Tests:

Without useMemo
ReactDOM.render(React.createElement(ComponentWithInlineFunction), document.getElementById('root'))
With useMemo
ReactDOM.render(React.createElement(ComponentWithUseCallback), document.getElementById('root'))

Run results for: With or without useMemo

Without useMemo

With useMemo