Unverified50% confidenceFactExact time
TTFT (time to first token) consists of two segments: frontend request preprocessing (tokenization, prompt concatenation) and backend prefill computation, and the KV cache only optimizes the latter.
1
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50%
Confidence
Long-term
Relevance
10/15/2026
First Seen
Sources
Related Entities
Related Claims
VerifiedTime to First Token (TTFT) refers to the time interval between a user submitting a request and the model outputting the first token, and is primarily constrained by the time cost of the prefill phase in which the model processes the input prompt.79% similarVerifiedTTFT is determined by the Prefill phase and is compute-bound, while TPOT corresponds to the Decode phase and is memory-bandwidth-bound.76% similarUnverified流式STT和TTS允许系统在处理未完成时就开始并行处理，从而压缩用户感知到的等待时间70% similarUnverifiedPrefix caching, by reusing KV vector caches for identical context prefixes, can bring 50%–80% computational savings in AI agent scenarios and significantly reduce time-to-first-token (TTFT) latency.69% similarUnverifiedAfter adopting a decoupled design for a TTS service, only the workers need to be scaled out when request volume surges, and the caching layer acts as a buffer to prevent downstream services from repeatedly computing the same text.69% similar
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