reactjs – WEBRTC| huge difference between ingress and egress

I am currently developing a cross-platform solution consisting of a mobile app and a Chrome extension that facilitates file transfers via WebRTC. I’ve noticed a significant performance anomaly when the connection is forced to use a TURN relay: there is a substantial discrepancy between ingress and egress throughput speeds.

Is this level of asymmetry typical when routing through a relay server, or does it indicate a deeper configuration issue? Furthermore, could external factors—such as a weak cellular signal on the mobile end or aggressive ISP throttling of UDP traffic—be the primary catalyst for this imbalance?