Best AI Architecture for Processing and Querying Large PDFs (7000 Pages) with Fast Response Time

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Hi everyone,

I’m building an AI-powered educational assistant that must answer questions grounded in very large PDFs (up to ~4000 pages per document). I’m currently using a RAG-based setup, but I’m facing serious production issues and would appreciate architectural guidance.

Current Problems:

  1. Very high latency

    • Responses take 25+ seconds.

    • Sometimes even longer with complex queries.

  2. Missing information in responses

    • The system retrieves only partial sections.

    • Important parts of the document are ignored.

    • Answers feel incomplete or fragmented.

  3. Requirements:

  • Fast response time (<3 seconds ideally)

  • High-quality, well-structured answers

  • Accurate grounding with page references

  • Ability to handle 4000+ pages reliably

  • Production-ready and scalable

Any one have a better Ai pipeline, or knew how to implement it in a proper way ?

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