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After loading each user's chat model into VRAM, send a minimal chat request with the real system prompt (num_predict=1) to populate the KV cache. The first real user message then only needs to process its own tokens rather than the full ~5,600-token system prompt, reducing cold-start TTFT from ~25s to <1s. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>