# Parsing Binary WebSocket Frames with DataView for Real-Time Canvas Viewports

In real-time multiplayer interfaces (such as live card tables or financial order books), parsing incoming JSON strings every few milliseconds creates significant Garbage Collection (GC) pauses on mobile devices.

By transmitting game telemetry as compact binary buffers instead of JSON, you eliminate string parsing overhead and keep frame times strictly under 16ms:

```plaintext
// transport/binaryDecoder.js
export function parseGameStatePacket(arrayBuffer) {
  const view = new DataView(arrayBuffer);
  
  // Read header and byte flags
  const packetType = view.getUint8(0);
  const activeSeat = view.getUint8(1);
  const potValue = view.getFloat64(2, false); // Big-endian 64-bit float
  const actionTimerRemaining = view.getUint16(10, false);

  return {
    type: packetType,
    seat: activeSeat,
    pot: potValue,
    timer: actionTimerRemaining
  };
}
```

**Why this pattern succeeds:**

*   Zero Garbage Collection Spikes: DataView reads directly from the raw ArrayBuffer without creating intermediate string variables in memory.
    
*   Minimal Network Overhead: A complete table state payload is packed into just 12 bytes, ensuring immediate delivery even across 3G/4G cellular connections.
    
*   For an operational reference of low-latency, binary-streamed web viewports running in production, inspect [this reference node](https://cv666.poker/).