Benchmark: removeChild vs no removeChild

Script Preparation code:

var parent = document.createElement("div");
for (let k = 0; k < 100; k++)
  parent.appendChild(document.createElement("div"));

var child = parent.firstChild;

Tests:

no removeChild
parent.appendChild(child); parent.insertBefore(child, parent.firstChild);
removeChild
parent.removeChild(child); parent.appendChild(child); parent.removeChild(child); parent.insertBefore(child, parent.firstChild);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
no removeChild
removeChild

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser/OS: Chrome 126 on Linux

View result in a separate tab

Test name	Executions per second
no removeChild	835930.8 Ops/sec
removeChild	594454.4 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**What is being tested?**

The provided JSON represents two test cases that measure the performance difference between using `appendChild` and `insertBefore` with or without removing a child element. The script preparation code creates a parent div element, appends 100 child div elements to it, and then selects the first child element as `child`. The test cases differ in how they manipulate the child element:

1. **"no removeChild"`: This test case only uses `appendChild` to insert the child element into the parent's children list.
2. **"removeChild"`: This test case also uses `insertBefore` before appending the child element, effectively removing and re-adding it.

**Options compared**

The two test cases compare:

* The use of `appendChild` alone (no removal) vs using `insertBefore` followed by `appendChild` (with removal)
* The number of executions per second for each approach

**Pros and Cons of each approach:**

1. **"no removeChild"`:
	* Pros:
		+ Simple and efficient, as it doesn't involve removing the element.
		+ May be faster due to fewer DOM operations.
	* Cons:
		+ May not account for removal-related overhead.
2. **"removeChild"`:
	* Pros:
		+ Takes into account the removal-related overhead, providing a more accurate comparison.
	* Cons:
		+ More complex and slower due to the additional `insertBefore` and `removeChild` operations.

**Other considerations:**

1. **Library usage:** None of the provided code uses any external libraries, so there's no library-specific optimizations or complexities to consider.
2. **Special JS features or syntax:** The test cases don't use any special JavaScript features or syntax that would require additional explanation.

**Alternative approaches:**

For a more comprehensive comparison, you might want to consider adding other test cases, such as:

* Using `removeChild` alone vs using `appendChild`
* Comparing the performance of different DOM manipulation methods (e.g., `insertAdjacentHTML`, `DOMSubtreeModification`)
* Testing the impact of removal-related overhead on performance

Keep in mind that these additional tests would require modifications to the existing script preparation code.

By running this benchmark, you'll gain insight into the performance differences between using `appendChild` and `insertBefore` with or without removals.

Related benchmarks:

removeChild vs no removeChild (version: 0)

Comparing performance of: no removeChild vs removeChild

Created: one year ago by: Guest

Jump to the latest result

no removeChild

removeChild

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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