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Speculative Decoding Acceptance Rate: My LLM Got 47% Slower

This story is from 2026-09-16. It is preserved in the archive; the latest stories are on the live feed.

I turned on speculative decoding on a Friday afternoon expecting a free 2x. My local 32B model went from 34 tokens/sec to 18. Not noise. Not a warmup artifact. Consistently, reproducibly, half speed. I had added a second model to my GPU, burned VRAM for it, and made everything worse. The thing nobo…

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  1. 2026-09-16 04:58 · DEV Community — Machine Learning
    Speculative Decoding Acceptance Rate: My LLM Got 47% Slower

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