On Wednesday, May 11, 2016 at 1:03:19 PM UTC+2, Diana Jokic wrote:
>
> Hey everyone,
>
> Firebug shows the load time for each request sent by the webpage in a 
> timeline thing under "Net", and then"All". I have a few questions about 
> this:
>
> 1) What is the blue line? What is the red line?
>

Blue line: point in time where the DOMContentLoaded 
<https://developer.mozilla.org/docs/Web/Events/DOMContentLoaded> was 
triggered
Red line: point in time where the load 
<https://developer.mozilla.org/docs/Web/Events/load> event was triggered

The tooltip when hovering the requests tells you the time these events got 
triggered relative to the request start time.
See also https://getfirebug.com/wiki/index.php/Net_Panel#Timeline.
 

> 2) Sometimes there are grasps; time between requests where, according to 
> firebug, nothing is happening. What causes this?
>

Parsing the HTML and dynamic requests done via JavaScript. See also 
http://stackoverflow.com/a/31347721/432681.
 

> 3) What is the onload time?
>

Time span since the first request started until the load event was 
triggered. See also 
https://getfirebug.com/wiki/index.php/Net_Panel#Request_summary.

Sebastian

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