Verified65% confidenceFactExact time
TTFT is determined by the Prefill phase and is compute-bound, while TPOT corresponds to the Decode phase and is memory-bandwidth-bound.
3
Sources
65%
Confidence
Long-term
Relevance
7/22/2026
First Seen
Sources
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.75% similarUnverifiedTTFT determines how long a user waits from sending a request to seeing the first token, while ITL determines the pace at which subsequent content is generated.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.67% similarVerifiedThe Prefill phase is a compute-intensive task with high demands on compute power; the Decode phase is a memory-access-intensive task that is sensitive to GPU memory bandwidth.67% similar
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