In my experience (a few years ago though, to be honest), RDS was absolutely terrible for high performance and&#x2F;or latency sensitive write workloads. Due to how (again, at the time) replication was handled -- amazon apparently did (at the time? still does?) synchronous writes to each AZ, and only completes the transaction when both return. When one AZ&#x2F;RDS-instance was slow or dropping packets (seemed oddly frequent at the time for cross-AZ traffic -- again about 3 years ago though), our production stack would catch fire and come to a crashing halt. Never again!