CQL Performance Issues - Get Content By Owner User ID


I was wondering if someone could inform me of the intended rate limiting behavior of using the Cloud Search By Content Endpoint?

I am using this endpoint /rest/api/content/search?cql=type=page&contributors= to try to get all pages where the user is the owner. I have a list of around 80 users, and am iteratively calling this endpoint. I don’t have the limit set so it defaults to a maximum of 25 pages returned.

After each call, the time it takes to get a response back increases, and then it just hangs around the 20th call? Is this intentional? If so, are there any other cloud api endpoints I can use to get the pages which the user is the owner of?