Benchmark: React Memo or No Memo

HTML Preparation code:

<div id="root"></div>

<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.15/lodash.min.js"></script>

Script Preparation code:

function Memo(props) {
  const handler = React.useMemo(() => {
      return _.debounce(props.handler, props.wait);
  }, [props.handler, props.wait]);
  return React.createElement("div", { className: handler() });
}

function NoMemo(props) {
  const handler = _.debounce(props.handler, props.wait);
  return React.createElement("div", { className: handler() });
}

var propCases = [{
  handler: function() { return Math.random(); },
  wait: 100
}, {
  handler: function() { return Math.random(); },
  wait: 200
}];
propCases.push(propCases[1]);

Tests:

Memo
propCases.forEach((props, i) => { ReactDOM.render(React.createElement(Memo, props, null), root); });
No Memo
propCases.forEach((props) => { ReactDOM.render(React.createElement(NoMemo, props, null), root); });

Historical Performance Data aggregated from 14 community runs

Desktop Results:

Chrome 14 runs

Memo

18K/s

No Memo

17K/s

View exact numbers

✓ Memo: 17,600 ops/sec
• No Memo: 17,425 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Memo
No Memo

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 6 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36

Browser/OS: Chrome 144 on Linux

View result in a separate tab

Memo

33K/s

No Memo

32K/s

View exact numbers

Test name	Executions per second
✓ Memo	33,243 Ops/sec
No Memo	31,934 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition JSON**

The benchmark definition represents two different approaches to optimizing React components:

1. **Memo**: This approach uses `React.useMemo` to memoize a function that debounces an event handler using Lodash's `_debounce` function. The memoized function is only recalculated when the dependencies (`props.handler` and `props.wait`) change.
2. **No Memo**: This approach directly uses Lodash's `_debounce` function on the event handler without memoizing it.

**Options being compared**

The two options being compared are:

* Using `React.useMemo` to memoize a debounced function (Memo)
* Not using `React.useMemo` and instead applying debouncing directly to the event handler (No Memo)

**Pros and Cons of each approach**

1. **Memo (using React.useMemo)**:
	* Pros:
		+ Reduces unnecessary recalculations by memoizing the debounced function, which only depends on its dependencies.
		+ Improves performance by avoiding redundant computations.
	* Cons:
		+ May introduce additional overhead due to the creation and management of a new scope for the memoized function.
2. **No Memo (not using React.useMemo)**:
	* Pros:
		+ Avoids creating an additional scope, which might reduce overhead.
	* Cons:
		+ Recalculates the debounced function every time it's called, potentially leading to performance issues.

**Library and purpose**

The Lodash library is used in both approaches. Specifically, `_debounce` is a function that takes a function as an argument and returns a new function that wraps the original function with a delay. In this case, `_.debounce(props.handler, props.wait)` creates a debounced version of the event handler, which only fires after the specified wait time has passed.

**Special JavaScript features or syntax**

This benchmark uses the following JavaScript features:

* ES6 classes (`function Memo()` and `function NoMemo()`)
* React Hooks (specifically, `React.useMemo`)
* Lodash functions (`_.debounce`)

These features are widely supported in modern browsers and JavaScript environments.

**Other alternatives**

Other approaches to debouncing event handlers might include:

* Using a library like Debounce.js or Moment.js
* Implementing debouncing manually using a loop or recursion
* Using async/await or promise chaining to delay the execution of the handler

However, React Hooks and Lodash's `_debounce` provide a concise and efficient way to implement debouncing in this specific use case.

React Memo or No Memo (version: 2)

Comparing performance of: `Memo vs No Memo`

Created: 6 years ago by: Registered User

Go to the latest result

Memo

No Memo

Historical Performance Data aggregated from 14 community runs

Desktop Results:

Chrome 14 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

React Memo or No Memo (version: 2)

Comparing performance of: Memo vs No Memo

Created: 6 years ago by: Registered User

Go to the latest result

Memo

No Memo

Historical Performance Data aggregated from 14 community runs

Desktop Results:

Chrome 14 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

Related benchmarks

Comparing performance of: `Memo vs No Memo`