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Your LLM decode is slow even though GPU compute utilization looks low. Why is it memory-bandwidth-bound?

The counterintuitive truth of LLM serving: token generation is limited by how fast you can read weights from memory, not by math. Once you see that, the whole optimization menu falls out of one number.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

The counterintuitive truth of LLM serving: token generation is limited by how fast you can read weights from memory, not by math. Once you see that, the whole optimization menu falls out of one number.

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