One of the things I talked about recently in my Gigabit Pro update video is that even though you have the bandwidth you likely will never make full use of it on any single task.
Sure it’s possible to run a speed test to fully saturate the connection as I have done many times, but when doing real world tasks things work differently. So even though I have a full six gigabits available, I’m usually only getting about half a gigabit to each location I’m sending data to.
The image above was taken from my Unifi app as I was uploading an 8.7 GB video to YouTube and Floatplane simultaneously. Each can only take about 500-600 megabits per second.
Remember the Internet is not one network. So it’s possible that within Comcast’s infrastructure I can utilize the full bandwidth. But once we cross outside the network it depends on how different networks interoperate and what kinds of bandwidth they allow across those crossing points. In some cases there are multiple networks to traverse!