How measure Finish、DomContentLoaded and Load time from Navigation Timing?

[張君豪]

Hello,

I'm use developer tool to measure page performance, and get the times(Finish、DOMContentLoaded and Load) on Network panel.

But I am not understand how to calculator the time from Navigation Timing?

If DOMContentLoaded and Load time is event execution time, domContentLoadedEventEnd-domContentLoadedEventStart=8, loadEventEnd-loadEventStart=6, it's not the same as the time of the Network panel. why?

[PhistucK]

This group discusses technical browser development issues, not web development.

This is off topic for this group, so continue this discussion either at net-dev or at google-chrome-developer-tools.

If you are talking about DOMContentLoaded: 282 ms and Load: 278 ms those times indicate the time it took from the time the page started to be rendered until the load or DOMContentLoaded events.
However, domContentLoadedEventEnd - domContentLoadedEventStart and loadEventEnd - loadEventStart indicate the time it took for the event listeners themselves to finish their work. Say, you added for (var i = 0; i < 99999999; i++) { console.log('1'); } to the load event listener and it took about a second to complete that execution, the result of loadEventEnd - loadEventStart would be around 1000.

☆PhistucK

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[PhistucK]

One thing to note is that I find it very, very weird that DOMContentLoaded fired after load. Sounds very buggy, because I think DOMContentLoaded is a prerequisite for load, but perhaps I am just not familiar with the rules.

☆PhistucK

[張君豪]

Sorry. I see get Navigation Timing code from PerformanceTiming.cpp.

I'm not understand the calculator rule, so I want to find the calculator code.

PhistucK於 2017年8月7日星期一 UTC+8下午8時57分45秒寫道：

☆PhistucK

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[Mohit Laad]

Hi,

Were you able to find the formual for Finish time.

I have tried a couple of things but could not conclude on this.