How-ToDevelopersSeptember 17, 2026

Keeping vLLM's prefix cache warm between agent turns

A local Qwen3.8 27B setup on two RTX 3090s under vLLM 0.28.0 went from 55% to 95% cached prefix, cutting a 120,000-token turn from ~150 seconds to 3 seconds. First-word latency averaged about half a minute before tuning.

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