Nested type array size - performance considirations

In the documentation it says that the default number of nested fields is 50. Does this refer to different fields in the document, or the number of objects in an array of a nested type?
In my es cluster i have documents with arrays of nested type with 10K-500K elements!
Is this considered a bad thing? if yes, in what way other than having many many documents.
When i query the cluster with nested query, when i hit documents that the array is huge the performance drops drastically, why is this?

I understand having an array of tens of thousands of objects creates tens of thousands documents, but why is the search time so slow?

Thanks

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