How the VPN industry is creating its stake in online gaming
techcrunch.com
techcrunch.com
The fact that this is so often the case points to either BGP peering being totally f'd at ISPs or deep packet inspection and traffic prioritization / de-prioritization algorithms mucking everything up.
I personally suspect the latter since at ZeroTier we've noticed that direct P2P performance is sometimes (for some ISPs) more consistent when the traffic is flowing over ZeroTier than "naked." This simply should not be. If anything encapsulation should have the opposite effect. My guess would be that the DPI traffic manglers don't know what to do with encrypted UDP traffic so they just send it on through.