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Date.now() vs new Date().getTime() vs performance.measure() vs anchoredClock2
(version: 0)
Comparing performance of:
Date.now() vs new Date().getTime(); vs performance.now() vs performance.measure vs Date.now() & performance.now
Created:
3 years ago
by:
Guest
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Script Preparation code:
let start = null; let end = null; let epochMs = Date.now(); let perfMs = performance.now();
Tests:
Date.now()
start = Date.now(); end = Date.now();
new Date().getTime();
start = new Date().getTime(); end = new Date().getTime();
performance.now()
start = performance.now() end = performance.now()
performance.measure
performance.mark('start') start = Date.now() const { duration } = performance.measure('span', 'start') end = start + duration
Date.now() & performance.now
// 1000.2534221 = offset delta const startDelta = performance.mark('start').startTime - 1000.2534221 startTime = 1000.2534221 + startDelta const endDelta = performance.measure('span_duration', 'start').duration endTime = 1000.2534221 + endDelta
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (5)
Previous results
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Test case name
Result
Date.now()
new Date().getTime();
performance.now()
performance.measure
Date.now() & performance.now
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Definition** The provided benchmark definition is: `"Date.now() vs new Date().getTime() vs performance.measure() vs anchoredClock2"` This benchmark compares the performance of four different approaches to measure time in JavaScript: 1. `Date.now()` 2. `new Date().getTime()` 3. `performance.measure()` 4. `anchoredClock2` (not explicitly explained, but we'll get to that later) **Options Compared** The options being compared are essentially methods for measuring time or creating a timing anchor in JavaScript. * `Date.now()` and `new Date().getTime()` both return the number of milliseconds since the Unix epoch (January 1, 1970, 00:00:00 UTC). While they appear similar, `Date.now()` is generally considered faster because it's more optimized. * `performance.measure()` is a newer method introduced in Chrome 112. It allows for more accurate timing measurements and can be used to create a timing anchor. * `anchoredClock2` is not explicitly explained in the benchmark definition, but based on the code snippets provided, it appears to be a custom implementation that uses a similar approach as `performance.measure()`. **Pros and Cons** Here's a brief overview of the pros and cons of each option: * `Date.now()`: + Pros: Fast, widely supported. + Cons: May not be accurate for very short time intervals (due to browser-specific optimizations). * `new Date().getTime()`: + Pros: More readable than `Date.now()`, can be useful in certain scenarios. + Cons: Generally slower than `Date.now()`. * `performance.measure()`: + Pros: More accurate, allows for creating a timing anchor. + Cons: Requires Chrome 112 or later, may have performance overhead. * `anchoredClock2` (not explicitly explained): + Pros: Not specified, but likely offers some benefits similar to `performance.measure()`. + Cons: Not widely supported, custom implementation. **Library and Syntax** In this benchmark, the following libraries/syntax are used: * None explicitly mentioned. However, it's worth noting that `performance.now()` uses a specialized method in modern browsers for measuring time. * Custom implementation (`anchoredClock2`). **Special JS Features or Syntax** There isn't any special JavaScript feature or syntax being tested here. **Other Considerations** When choosing a timing mechanism, consider the following factors: * Accuracy: How precise do you need your measurements to be? * Readability: Will your code be more readable with `Date.now()` or `new Date().getTime()`? * Performance overhead: Are the additional operations introduced by `performance.measure()` worth the benefits? **Alternatives** If you're looking for alternatives to these options, consider: * Using a dedicated timing library like `microtime` (Node.js) or `moment-timezone` (browser-based). * Utilizing browser-specific APIs, such as `requestAnimationFrame()` for measuring time intervals. * Implementing your own custom timing mechanism using Web Workers or WebAssembly. Keep in mind that these alternatives may offer different trade-offs in terms of accuracy, performance, and readability.
Related benchmarks:
Date.now() vs new Date().getTime() vs performance.now()
Date.now() vs new Date() vs performance.now()
Date.now() vs new Date().getTime() vs performance.now() with calc
Date.now() - Date.now() vs new Date() - new Date()
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