Benchmark: querySelectorAll vs getElementsByTagName vs getElementsByClassName with 968 nodes

querySelectorAll vs getElementsByTagName vs getElementsByClassName with 968 nodes (version: 0)

Comparing performance of: Get td elements by data attribute vs Get inner paragraph elements by tag name vs Get inner paragraph elements by tag name with querySelectorAll vs Get td elements by class attribute vs Get td elements by class with querySelectorAll

Created: 5 years ago by: Guest

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HTML Preparation code:

<table>
<thead>
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    <th>Stuff</th>
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</table>
<table>
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</tbody>
</table>
<table>
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</thead>
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</table>
<table>
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<thead>
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    <th>Stuff</th>
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    <th>Ok</th>
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    <th>Ok</th>
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    <th>Ok</th>
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    <td data-stuff="blah" class="blah"><p>Hi!</p></td>
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    <td data-stuff="blah" class="blah"><p>Hi!</p></td>
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</table>

Tests:

Get td elements by data attribute
const byDataAttribute = document.querySelectorAll('[data-stuff="blah"]')
Get inner paragraph elements by tag name
const byTagName = document.getElementsByTagName('p')
Get inner paragraph elements by tag name with querySelectorAll
const byTagNameWithQSAll = document.querySelectorAll('p')
Get td elements by class attribute
const byClassName = document.getElementsByClassName('blah')
Get td elements by class with querySelectorAll
const byClassWithQSAll = document.querySelectorAll('.blah')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Get td elements by data attribute
Get inner paragraph elements by tag name
Get inner paragraph elements by tag name with querySelectorAll
Get td elements by class attribute
Get td elements by class with querySelectorAll

Fastest: N/A

Slowest: N/A

Latest run results:

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This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

I'll do my best to provide a helpful answer.

Based on the provided benchmark results, I notice that:

* The test cases are all related to querying DOM elements using different methods (`document.querySelectorAll`, `document.getElementsByTagName`, `document.querySelectorAll`, etc.).
* The browsers and devices used for testing are Safari 13 on Mac OS X 10.15.5.
* The execution times vary significantly between tests, with the highest execution time being around 500 seconds for "Get td elements by class attribute" (TestName: Get td elements by class attribute).

Considering these observations, here's a possible answer:

**Optimization suggestion**

To improve the performance of the DOM query methods, I would recommend using `querySelectorAll` instead of `querySelector` when selecting elements with a specific class or data attribute. This is because `querySelectorAll` returns all matching elements, whereas `querySelector` returns only one element.

For example, replace the following lines:
```javascript
const byClassName = document.getElementsByClassName('blah');
```
with:
```javascript
const byClassWithQSAll = document.querySelectorAll('.blah');
```
Similarly, replace the following lines:
```javascript
const byDataAttribute = document.querySelectorAll('[data-stuff="blah"]');
```
with:
```javascript
const byDataAttribute = document.querySelectorAll('[data-stuff="blah"]');
```
This change can help reduce the number of elements being returned and improve performance.

Additionally, consider using `querySelector` instead of `getElementsByTagName` for tag name-based queries, as it is generally faster and more efficient.
```javascript
const byTagName = document.querySelector('p');
```
```javascript
const byTagNameWithQSAll = document.querySelectorAll('p');
```
By applying these suggestions, you may be able to improve the performance of your DOM query methods and reduce the execution times. However, please note that further optimization will depend on the specific requirements and constraints of your application.

Related benchmarks: