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Reranker Latency vs Quality Trade-offs (ANSWERED)

Scenario BasedRAGMedium15 min read

Medium RAG interview question on reranker latency vs quality trade-offs — architecture, trade-offs, eval, and production patterns.

TL;DR — Quick Answer

Heavier cross-encoders improve nDCG but add 100–500ms. Use lightweight rerankers at high QPS, cascade cheap→expensive, or skip reranking on cache hits. Measure nDCG uplift per millisecond before upgrading model size.

The Interview Question

Explain reranker latency vs quality trade-offs. How would you design, implement, and evaluate this in a production RAG system? Discuss trade-offs and failure modes.

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