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Date.now() vs performance.now()324234
(version: 0)
Performance measure can be slow
Comparing performance of:
performance.now vs Date.now
Created:
5 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var times = [];
Tests:
performance.now
performance.now()
Date.now
Date.now()
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
performance.now
Date.now
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36
Browser/OS:
Chrome 136 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=604005" width="100%" height="500px"></iframe>
Date.now
30.7M/s
performance.now
10.2M/s
View exact numbers
Test name
Executions per second
✓
Date.now
30,725,456 Ops/sec
performance.now
10,221,424 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks. **What is being tested?** The provided JSON represents two benchmark definitions: `Date.now()` and `performance.now()`. These are both methods used to measure time in JavaScript, but they have different origins and usage patterns. `Date.now()` returns the number of milliseconds since January 1, 1970, 00:00:00 UTC. This method is part of the built-in `Date` object and is often used for simple timing measurements. `performance.now()`, on the other hand, returns the value (in fractional seconds) of a performance counter, which is a timestamp that represents a continuous, monotonically increasing value. This method is specifically designed to measure short periods of time and is more suitable for measuring frame rates or response times in interactive applications. **Options compared** The two benchmark definitions are being tested against each other, with `Date.now()` serving as the "baseline" or "manual" timing measurement, while `performance.now()` uses the browser's performance counter to measure time. This comparison allows users to see which method is more accurate and reliable for their specific use case. **Pros and Cons** - **Manual Timing (Date.now())**: Pros: + Simple and straightforward + Works in most environments, including older browsers Cons: + May not be as accurate due to system clock variations + Can be affected by various factors, such as network latency or CPU usage - **Performance Counter (performance.now())**: Pros: + More accurate and reliable for short periods of time + Designed specifically for measuring performance-related metrics Cons: + May not work in older browsers that don't support the `performance` API + Can be affected by browser-specific optimizations or rendering overhead **Library usage** There is no explicit library mentioned in the provided JSON. However, if you're using a modern JavaScript framework like React or Angular, you might be relying on libraries like `react-dom` or `angular/core` that provide implementation details for these timing measurements. **Special JS feature/syntax** There are no special JS features or syntax mentioned in the provided information. Both `Date.now()` and `performance.now()` are standard JavaScript methods. **Alternatives** If you need to measure time in JavaScript, here are some alternative approaches: 1. **setTimeout() and clearTimeout()**: You can use these functions to create a simple timer that measures the execution time of a block of code. 2. **requestAnimationFrame() and cancelRequestAnimationFrame()**: These functions provide a more accurate way to measure frame rates or animation timing in web applications. 3. **Web Performance API**: This API provides a set of methods for measuring performance-related metrics, such as response times, load times, and memory usage. Keep in mind that the choice of measurement method depends on your specific use case and the requirements of your project.
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