[Warning. mere speculation]
Perhaps it has to do with having to make a system call to get the current
time.
Alex.
On Fri, Jun 5, 2020 at 1:57 PM Paweł Badeński <pawel.baden...@gmail.com>
wrote:
> Hi,
>
> Wondering if someone can help with a bit of context to satisfy mu
> curiosity! :D
>
> We are using Date.now & new Date quite a bit in our application (financial
> domain). I run a few micro-benchmarks and was wondering why do these report
> being relatively slow (as compared to construction of other objects). In
> fact all Date methods seem rather slow. Am I having wrong expectations for
> these to be faster? Are they as fast as they could be, or is it that Date
> just never got enough love in terms of performance optimizations? Really
> curious to get more color on this!
>
> Benchmarks:
>
> Date.now() x 9,454,436 ops/sec ±1.09% (65 runs sampled)
>
> new Date() x 5,594,688 ops/sec ±1.87% (64 runs sampled)
>
> [1, 2, 3] x 124,719,052 ops/sec ±0.90% (64 runs sampled)
>
> { a: 1, b: 2, c: 3 } x 112,368,878 ops/sec ±0.83% (65 runs sampled)
>
> new Object({ a: 1, b: 2, c: 3 }) x 32,547,566 ops/sec ±0.64% (64 runs
> sampled)
>
> Source: https://stackblitz.com/edit/js-dvq8ri
>
> Thanks!
> Pawel
>
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