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window.getComputedStyle vs. getBoundingClientRect width
(version: 0)
Comparing performance of:
getComputedStyle vs getBoundingClientRect
Created:
2 years ago
by:
Guest
Go to the latest result
HTML Preparation code:
<div id="foo"></div>
Tests:
getComputedStyle
const x = window.getComputedStyle(document.getElementById('foo')).width
getBoundingClientRect
const x = document.getElementById('foo').getBoundingClientRect().width;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
getComputedStyle
getBoundingClientRect
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Browser/OS:
Chrome 122 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=508976" width="100%" height="500px"></iframe>
getBoundingClientRect
839K/s
getComputedStyle
560K/s
View exact numbers
Test name
Executions per second
✓
getBoundingClientRect
839,327 Ops/sec
getComputedStyle
560,075 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, compared, and considered. **Benchmark Overview** The benchmark is designed to compare the performance of two approaches: `window.getComputedStyle` and `getBoundingClientRect`. The goal is to determine which method is faster for retrieving the width of an element using a specific HTML structure. **Options Compared** Two options are being compared: 1. **`window.getComputedStyle`**: This method retrieves the computed style properties of an element, including its width. 2. **`getBoundingClientRect`**: This method returns the size and position of an element relative to the viewport. **Pros and Cons of Each Approach** * `window.getComputedStyle`: + Pros: - Can retrieve all style properties, not just dimensions (width, height, etc.) - Can be used for more complex layout calculations + Cons: - May incur additional overhead due to the need to parse and execute JavaScript code - May require more memory allocations, especially if dealing with large numbers of elements * `getBoundingClientRect`: + Pros: - Typically faster and more efficient than `getComputedStyle` - Returns only the dimensions (width, height) needed for this benchmark + Cons: - Only returns dimensions, not all style properties - May not be suitable for complex layout calculations **Library Usage** There is no explicit library usage in this benchmark. However, the `document.getElementById` and `window.getComputedStyle` methods are part of the standard JavaScript API. **Special JS Features or Syntax** None are explicitly mentioned in this benchmark. **Other Considerations** * **Browser and Device**: The benchmark appears to be run on a desktop browser (Chrome 122) with Windows as the operating system. * **Execution Frequency**: The test runs approximately 839,326 times per second for `getBoundingClientRect` and 560,075 times per second for `getComputedStyle`. **Alternatives** If you want to explore alternative approaches or libraries for measuring performance in JavaScript, here are some options: 1. **`requestAnimationFrame`**: This method allows you to schedule a callback function to be executed at the next available opportunity on the browser's event queue. 2. **Web Workers**: These allow you to run JavaScript code in separate threads, which can improve performance and scalability for CPU-intensive tasks. 3. **Libraries like Lighthouse** or **Benchmark.js**: These libraries provide built-in support for benchmarking and profiling JavaScript applications. Keep in mind that the best approach will depend on your specific use case and requirements.
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