PersonaPlex produces choppy/unusable audio on DGX Spark (GB10)

Environment

• Hardware: DGX Spark with GB10 (Blackwell, sm_121)
• Memory: 128GB unified
• PyTorch: 2.9.0+cu130
• PersonaPlex: latest from pip

Problem

Audio output is extremely choppy and unusable for real-time conversation. The model runs but cannot keep up with real-time audio streaming.

Steps to reproduce

1. Install PersonaPlex on DGX Spark following README
2. Run the server with python -m moshi.server --ssl <path>
3. Connect via web UI and attempt conversation
4. Audio is choppy both from host machine and remote clients

What I've tried

• Disabled torch.compile and CUDA graphs
• Disabled Flash Attention (SDPA fallback)
• Various quantization approaches (all failed or didn't help)

Expected behavior

Real-time conversational audio as demonstrated in the model card