Riot/Valorant servers that turned out to be a routing or peering problem on Comcast’s backbone

There are documented cases of Xfinity having exactly 10-second latency/packet spikes specifically to Riot/Valorant servers that turned out to be a routing or peering problem on Comcast’s backbone (one well-known example was tied to a node in the Independence, MO area). Riot support even confirmed it was on Comcast’s side in some of those reports.

A clean, repeating 10-second pattern can sometimes come from:

• A congested or flapping peering link
• A specific route that is being load-balanced or re-evaluated on a timer
• An intermediate hop that is dropping or delaying UDP traffic in a cyclic way

Stuart, FL has this problem