IIRC most large scale deployments have it at around 75-95% of traffic that only requires STUN (which is only used for the handshake & holepunching, not for the

IIRC most large scale deployments have it at around 75-95% of traffic that only requires STUN (which is only used for the handshake & holepunching, not for the actual traffic). TURN is used for the remaining 25%-5%. STUN is cheap, easy and does not require a lot of traffic. TURN on the other hand requires a lot of bandwidth, which can be expensive.