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Hello samu-2,
Thank you for the post. I agree with your point that the slow response time issue does not directly relate to the replication lag. Long-running queries in the primary instance could potentially impact the replication lag between the primary instance and the read replica but do not necessarily slow down the performance of the read replica directly.
What we intend to highlight in this scenario is the relationship between the primary RDS instance and its replica. To prepare for the exam, it would help the candidate to understand what happens during the replication process and what you should take note of whenever you observe that the data takes a while to synchronize.
Happy to help if you have any other concerns or clarifications. Good luck with passing your AWS Database Specialty Exam.
Joseph Pineda
