WebRTC is the gold standard for real-time peer-to-peer data and media streaming. However, out-of-the-box WebRTC configurations are tuned for video conferencing where a few dropped frames or minor latency variations are acceptable. For remote desktop control, every millisecond counts.
The Bottleneck: Screen Capture & Encoding
Before any pixel is transmitted over WebRTC, it must be captured and compressed. We moved from standard window graphics capture APIs to the Windows DXGI Desktop Duplication API, which copies desktop frames directly into GPU memory buffers. This reduced frame capture overhead to under 2ms.
ICE candidate gathering optimization
To reduce connection setup times and latency:
- We deployed dedicated CoTurn TURN/STUN servers close to our target availability zones.
- We restricted ICE protocols to UDP-only to prevent TCP packet re-transmission delays.
Through these combined architecture updates, Qrion achieves real-time interactive latency averages of 12.4ms, allowing flawless remote desktop control and high-fidelity video streams.