I Built TCP Inside the Browser Using WebRTC

Why WebRTC alone is not enough

WebRTC gives you a fast encrypted pipe.
But when you try to send large files, browsers crash, tabs freeze, and memory explodes.

I learned this the hard way.

The real problem — browser memory

RTCDataChannel.bufferedAmount is not receiver memory.
It is sender-side browser RAM waiting to be flushed to the network.

When the receiver is slow: