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Is prefill speed more important than generation speed for the actual user experience?

This story is from 2026-08-31. It is preserved in the archive; the latest stories are on the live feed.

I’ve been benchmarking local LLMs lately, and I’m starting to think we put too much emphasis on generation tokens/sec. For interactive use, prefill speed and TTFT seem just as important — maybe even more important in some cases. If I send a long prompt and nothing happens for 8–10 seconds, the mode…

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  1. 2026-08-31 04:31 · r/LocalLLM
    Is prefill speed more important than generation speed for the actual user experience?

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