So I have AT&T fiber in Edmond, Oklahoma and have been having buffering issues with YouTube randomly. After my troubleshooting I believe it may be a routing issue.   The top server route I have no issues with but the bottom one only gets around 500Kbps. Multiple speed test prove my connect

I'm using my 2nd laptop as a remote desktop. Does the bandwidth traffic from using it count towards data usage if both computers are on the same network? I plan to use it a lot and don't want to be surprised at the end of the month.