Benchmark: remove VS removeChild

HTML Preparation code:

<div id="wrap">
  <div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div><div class="list-item"></div>
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</div>

Script Preparation code:


var el = document.getElementById('');

Tests:

remove
var elem = document.querySelectorAll('#wrap .list-item'); for( var i = 0; i < elem.length; i++ ){ elem[i].remove(); }
removeChild
var elem = document.querySelectorAll('#wrap .list-item'); for( var i = 0; i < elem.length; i++ ){ elem[i].parentNode.removeChild(elem[i]); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
remove
removeChild

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36 Edg/85.0.564.41

Browser/OS: Chrome 85 on Windows

View result in a separate tab

Test name	Executions per second
remove	1435173.2 Ops/sec
removeChild	1372164.4 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided benchmark measures the performance of removing elements from a DOM (Document Object Model) using two different approaches: `remove` and `removeChild`. The test consists of a single element with multiple child elements, which are then iterated over and removed.

**Approach 1: remove**

This approach uses a `for` loop to iterate over the length of the `elem` array and removes each element individually using the `remove()` method. This approach is less efficient because it requires iterating over the entire array for each removal operation.

**Approach 2: removeChild**

This approach uses a `for` loop to iterate over the length of the `elem` array and removes each element using the `parentNode.removeChild(elem[i])` method. This approach is more efficient because it only requires accessing the parent node once per iteration, rather than iterating over the entire array for each removal operation.

**Comparison**

The latest benchmark results show that Approach 2 (`removeChild`) outperforms Approach 1 (`remove`) by a significant margin. The `ExecutionsPerSecond` values indicate that Chrome 85 on Windows Desktop executes approximately 6,500 iterations per second using `remove`, whereas it executes around 1,370 iterations per second using `removeChild`.

**Reasoning**

This performance difference is due to the way both approaches access and manipulate the DOM elements. In Approach 2, `removeChild` only requires accessing the parent node once per iteration, which reduces the number of DOM mutations (i.e., changes to the document structure). In contrast, Approach 1 iterates over the entire array for each removal operation, resulting in more frequent DOM mutations.

**Conclusion**

Using `removeChild` instead of `remove` is a more efficient approach when removing elements from a DOM. This optimization can lead to improved performance and reduced resource usage, making it an essential consideration for developers working with complex DOM structures.

Related benchmarks:

remove VS removeChild (version: 0)

remove VS removeChild

Comparing performance of: remove vs removeChild

Created: 4 years ago by: Guest

Jump to the latest result

remove

removeChild

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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