Can someone explain the speed discrepancy?

THANK YOU, EVERYONE WHO RESPONDED. I appreciate the information & help. Unfortunately, there are too many responses coming in for me to have time to respond to each one individually.

My game download is peaking around 200 Mbps, while a speed test shows over 3 times that.

I did have another game updating in a different launcher, but I paused that and saw no change in download speed