A practical check without command lines, invented metrics, or specialist knowledge.
Use the same check before and after enabling the extension. This makes the comparison fairer and easier to understand.
1
Open Flash Route.
2
Make sure the extension is turned on.
3
Check that the required service is selected.
4
Refresh that service page.
5
Repeat the same scenario before and after enabling it.
Checking YouTube
Use the same video, the same quality, and roughly the same section. Look not only at “speed”, but at how quickly playback starts and whether the buffer holds.
Why Speedtest alone is not enough
Speedtest checks the connection to its own test server. A good or bad result does not always show the quality of the path to YouTube or another specific service.