Can you explain the significance of network activity groupings within the Firebug Net tab?

Can you explain the significance of different splitter lines on the Net tab in Firebug?

In this screenshot, line 1 and 2 appear to be grouped together. However, line 3 stands alone.

What do these groupings represent?

Answer №1

To maintain a manageable scale for the X axis (representing time), the waterfall graph divides the timeline and restarts displaying new requests that begin later in the page's lifespan from the beginning.

Put simply, when a new request starts after a set period of time (default is 1 second) since the previous one finished, it is shown as starting from the beginning of the graph. This prevents the X axis from endlessly expanding, which would hinder readability of the graph.

Each request starting from the beginning creates a distinct group, visually separated by a slightly bolder horizontal line.

The preference extensions.firebug.netPhaseInterval [ms] allows users to specify the interval at which the time break should occur (default is 1000 ms). Setting it to 0 disables this grouping feature altogether.

For more information, visit:

Sincerely, Jan

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