I made it a point to watch internet traffic before and during the game using Akamai's real time web monitor. Here's a snapshot taken at 8:17 right around the beginning of the half time. it shows traffic 5% above normal mainly in the North East and California regions.
Here's a snap shot taken right towards the end of her show. showing a 4% drop below normal. So in 14 minutes, internet traffic took a 9% slump! I would say many people had their eyes on TV rather than Netflix!
Here's another snapshot around 9:00 PM showing traffic up to 0% at Normal.
And finally......the million dollar question: Did Beyonce cause the outage at the Stadium?!!