23 October 2026

vLLM's new KV transfer method roughly triples how fast answers begin

First reported

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  • vLLM, an open-source system for running AI models quickly, changed how it moves intermediate model data between machines.
  • The change, called push-based KV transfer, sends that data ahead of time instead of waiting for it, which cuts the delay before a reply starts.
  • Reported time to first token drops roughly 3x, and the time to produce each later word improves by up to 30%.

How it was covered

Deep Learning WeeklyEditorial team

Push-based KV transfer design, time-to-first-token and time-per-output-token improvements