Benchmark: cached matchMedia

Script Preparation code:

window.mql = window.matchMedia('(min-width: 400px)');

Tests:

cached MediaQueryList
window.mql.matches;
non-cached MediaQueryList
window.matchMedia('(min-width: 400px)');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
cached MediaQueryList
non-cached MediaQueryList

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 23 days ago)

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 18 on iOS 18.4

View result in a separate tab

Test name	Executions per second
cached MediaQueryList	883164.9 Ops/sec
non-cached MediaQueryList	36838.7 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

**What is tested on the provided JSON?**

The provided JSON represents two test cases for measuring the performance of JavaScript microbenchmarks related to the `matchMedia` API.

1. **Cached MediaQueryList**: This test case measures the performance of accessing the `matches` property of a cached ` MediaQueryList` object. The caching mechanism is used when the same media query is used multiple times in quick succession.
2. **Non-cached MurdochMediaList**: This test case measures the performance of creating and accessing a new `MediaQueryList` object without using any caching mechanisms.

**Options compared**

Two options are being compared:

1. **Cached MediaQueryList**: Using caching to improve performance when the same media query is used multiple times.
2. **Non-cached MurdochMediaList**: Not using caching, which may lead to slower performance due to the overhead of creating a new `MediaQueryList` object each time.

**Pros and Cons**

**Cached MediaQueryList:**

Pros:

* Improves performance by reducing the number of DOM mutations required for subsequent requests
* Reduces CPU overhead by reusing cached results

Cons:

* May lead to slower initial performance due to the need to cache the media query result
* May not be suitable for all use cases where caching is not feasible or desirable

**Non-cached MurdochMediaList:**

Pros:

* Can provide accurate measurements of non-cached performance
* Does not rely on caching, which can be beneficial in certain scenarios

Cons:

* Slower performance due to the overhead of creating a new `MediaQueryList` object each time
* May lead to inaccurate results if caching is enabled elsewhere in the application

**Other considerations**

The choice between these two approaches depends on the specific use case and requirements. If the same media query is used multiple times in quick succession, using caching can improve performance. However, if accuracy and non-cached performance are more important, not using caching may be a better option.

**Library and purpose**

In the provided benchmark code, ` MurdochMediaList` is mentioned, but it seems to be an error or a placeholder. In reality, there is no such library as MurdochMediaList in JavaScript. It's likely that the author meant to use ` MediaQueryList`, which is part of the `matchMedia` API.

**Special JS feature or syntax**

There are no special features or syntax used in this benchmark code that require specific knowledge beyond what is provided by the standard JavaScript language.

I hope this explanation helps!

Related benchmarks:

cached matchMedia (version: 0)

Comparing performance of: cached MediaQueryList vs non-cached MediaQueryList

Created: 6 years ago by: Guest

Jump to the latest result

cached MediaQueryList

non-cached MediaQueryList

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):