Unverified50% confidenceConceptExact time
TTFT (time to first token) is mainly determined by the prefill stage, with computation roughly proportional to context length; prefix caching can reuse already-computed KV states and only prefill the newly added portion.
1
Sources
50%
Confidence
Long-term
Relevance
10/20/2026
First Seen
Sources
4 DGX Sparks Test DeepSeek V4.1 Flash: How Good Is Local Inference Productivity?
bilibiliAI一平米10/20/2026
Related Entities
Related Claims
VerifiedTTFT（首个token生成时间）是衡量LLM用户体验的核心指标，决定用户从提交请求到看到第一个字符的等待时长73% similarUnverifiedLLM inference latency is typically broken down into Time To First Token (TTFT) and Time Per Output Token (TPOT).72% similarUnverifiedOnline inference pursues first-token latency and tail latency, requiring continuous batching, preemptive scheduling and fine-grained KV Cache paging management.67% similarUnverifiedIdempotency keys usually need a reasonable TTL (such as 24 hours) and must be used together with an operation record table so that completed actions can still be identified through reconciliation logic after the key expires.65% similarUnverifiedTime to First Byte (TTFB) reflects the latency from when a request is sent to when the model returns the first token, encompassing network transmission, request queue waiting time, and model warm-up time.64% similar
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