huggingface / huggingface/hf_transfer

Why is downloading extremely slow at the end of each shard?

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Description

```bash
export HF_HUB_ENABLE_HF_TRANSFER=1
huggingface-cli download Qwen/QwQ-32B-Preview
```

```
model-00007-of-00017.safetensors: 23%|█████████████████ | 912M/3.90G [00:23<00:45, 65.8MB/s]
model-00007-of-00017.safetensors: 99%|████████████████████████████████████████████████████████████████████████▌| 3.88G/3.90G [05:45<01:32, 228kB/s
```

This only happens in some clusters.

Could anyone help me figure out the possible cause?

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