What are the limitations of array size at document in elastic search?

I have document which have array.

{
   "id" :1,
   "UserIds":[1,2,4]
}

Given that UserIds is indexed field
What are the performance implications of having several elements on UserIds Array on search?
Also why when sending single request it take 50ms, however if I sent 100 parallel request it take up to 500ms?

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