pfSense

When switching back to the traffic graph page, the graph restarts as designed but the data shown is now half actual.

Using a new window or a different browser for the download works as expected because the original graph is still showing in the foreground of the original browser window.

To reproduce:

• open the traffic graph page
• open another tab in the same browser to start a download
• switch back to the traffic graph tab, speed is half
• (Shift+) reload the page in the browser, and it doubles to the expected speed

and

• open the traffic graph page
• open another browser or new browser window to start a download, leaving the traffic page open
• in the traffic graph window, speed remains as expected

It's more obvious if one opens a remote and local traffic graph at the same time, only the one will show the lower speed.

Reproduced on 2.6 and 23.01, with and without traffic shaping, per thread : https://forum.netgate.com/topic/178542/traffic-graph-shows-half-actual-throughput-in-some-scenarios