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LLM FoundationsMedium· Normalization· Inference Efficiency
Why do modern LLMs use RMSNorm instead of LayerNorm?
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See plansRMSNorm is preferred in modern LLMs primarily due to memory-bandwidth efficiency. Normalization operations often account for approximately 25% of total runtime despite contributing less than 0.2% of total FLOPs. By switching to RMSNorm, models achieve significant speedups without sacrificing performance, a trend observed across multiple major model families.