vLLM Prefix Caching: One Timestamp Dropped My Hit Rate From 89% to 3%
On Tuesday my support bot's time to first token roughly tripled, and nobody had touched the model, the GPU, or vLLM. The only change in the deploy was one helpful line at the top of the system prompt: Current date and time: 2026-10-27T14:03:22Z That line cost me almost all of my vLLM prefix caching…
Read the full story at DEV Community — Machine Learning ↗
Timeline · 1 report
- 2026-11-10 19:20 · DEV Community — Machine Learning
vLLM Prefix Caching: One Timestamp Dropped My Hit Rate From 89% to 3%