# Hugging Face — How Long Prompts Block Other Requests - Optimizing LLM Performance

- Company: Hugging Face (huggingface.co)
- Announced: 2025-06-12T08:00:13+00:00
- Category: research-paper
- Subject: Platform
- Source: https://huggingface.co/blog/tngtech/llm-performance-blocked-by-long-prompts
- Record: https://forck.live/items/1676-how-long-prompts-block-other-requests-optimizing-llm-performance

The article discusses optimization of LLM performance, specifically how long prompts block other requests, and describes a vLLM update that implements parallel prefills with a limit on long prompt requests to reduce time-to-first-token for short prompts.

## Evidence

Verbatim from https://huggingface.co/blog/tngtech/llm-performance-blocked-by-long-prompts:

> In one of the latest vLLM updates, an improved strategy has been implemented: it allows for parallel prefills of different requests but with a limit to the number of concurrently processed long prompt requests.

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Record: https://forck.live/items/1676-how-long-prompts-block-other-requests-optimizing-llm-performance
Catalogue: https://forck.live/llms.txt
Feed: https://forck.live/feed.md