[Bug]: concurrent_requests 25 has no efftect in graphrag since use fnllm with vllm/sglang

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Describe the bug

when use openai compatible model with vllm/sglang since graphrag 1.0 using fnllm ， concurrent_requests =25 has no efftect ：

when use graphrag 0.5

Steps to reproduce

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Expected Behavior

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GraphRAG Config Used

# Paste your config here

Logs and screenshots

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Additional Information

• GraphRAG Version:
• Operating System:
• Python Version:
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