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Speculative Decoding at High Batch Size: Where the 3x Speedup Turns Into a Tax

This story is from 2026-10-20. It is preserved in the archive; the latest stories are on the live feed.

TL;DR Published speculative decoding speedups (2x to 3x) are almost always measured at low concurrency. The two vLLM posts I read this week report no concurrency sweep. Speculation spends spare compute to save memory traffic. When the verify pass stops being memory-bound, the spare compute is gone…

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  1. 2026-10-20 14:05 · DEV Community — Machine Learning
    Speculative Decoding at High Batch Size: Where the 3x Speedup Turns Into a Tax

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