What would be the best way to get an accurate

Question

What would be the best way to get an accurate

fetch response time?

I've tried timing it myself however my time often disagrees with the browser timing, and there's often a noticeable discrepancy between timings on Chrome vs Firefox (from 5-1000ms)
Is there anyway to get the timing from the browser, or achieve better accuracy timing it myself?

Here's my attempt

0

22.01.2022

11 ответов

11 просмотров

VantaRabbit Автор вопроса

Perlik Yubenji
you can't. processing of JS and browser APIs is de...

Damn 😔

0

23.01.2022

Perlik Yubenji

VantaRabbit
Damn 😔

but why does getting accurate figure matter?

0

23.01.2022

Akshit

instead of Date.now, use performance.now. Though yes they wont be same as there are a lot of variables (cpu frequency, load, pending interrupts, network latency, event loop, etc) in play

0

23.01.2022

VantaRabbit Автор вопроса

Akshit
instead of Date.now, use performance.now. Though y...

performance.now() was actually what I tried first, and saw similar behaviour, so I've continued using Date.now(). Perhaps I'll have to revisit it.

0

23.01.2022

Akshit

VantaRabbit
performance.now() was actually what I tried first,...

yeah then its your network latency being unpredictable

0

23.01.2022

VantaRabbit Автор вопроса

Akshit
yeah then its your network latency being unpredict...

That can't be it. The browser timing is stable, and consistent with command line pings.

0

23.01.2022

VantaRabbit Автор вопроса

VantaRabbit
That can't be it. The browser timing is stable, an...

I should clarify, by "browser timing" I'm talking about the the timings displayed in the Networking tab of the developer tools.

0

23.01.2022

Akshit

VantaRabbit
That can't be it. The browser timing is stable, an...

oh also javascript timers are made to be a bit inaccurate

0

23.01.2022

VantaRabbit Автор вопроса

Akshit
oh also javascript timers are made to be a bit ina...

Yeah, that's what's got me scratching my head. I read about that in MDN. I just realized that I've had cached disabled, with it enabled I'm still seeing wildly inaccurate timing but in the other direction. I know my ping should be between 50-70ms but with cache enabled, I'm seeing 5-6ms with it disabled I'm seeing 100+

0

23.01.2022

VantaRabbit Автор вопроса

the answer here was use web sockets. So far, waaay better accuracy.

0

24.01.2022

Perlik Yubenji · Accepted Answer

Perlik Yubenji

you can't. processing of JS and browser APIs is determined by the underlying CPU interrupts.

0

23.01.2022

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