Is there a knowledge base size limitation for creating my own GPT?

I have seen the performance really nosedives if I ask it questions related to larger knowledge base file. For reference, I am playing around with creating a semiconductor quality assistant with a knowledge base of all relevant standards for plastic ICs.

It frequently times out if I ask it questions related to a 200 page standards document. Is there something I am missing here? What additional information should I provide in this post?

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