PEFT is how everyone fine-tunes large models now. The signal is the low-rank insight behind LoRA, why it cuts memory so much, and what 4-bit QLoRA adds. Here is the answer that goes past 'it's efficient fine-tuning.'
Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.
PEFT is how everyone fine-tunes large models now. The signal is the low-rank insight behind LoRA, why it cuts memory so much, and what 4-bit QLoRA adds. Here is the answer that goes past 'it's efficient fine-tuning.'
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