The Amazon Relational Database Service (Amazon RDS) Multi-AZ deployments with two readable standbys now supports next-generation General Purpose gp3 storage volumes. Amazon RDS gp3 volumes give you the flexibility to provision storage performance independently of storage capacity, paying only for the resources you need. Amazon RDS Multi-AZ deployments with two readable standbys provides up to 2x faster transaction commit latency, automated failovers typically under 35 seconds, and two readable standby instances.
Source:: Amazon AWS