AWS announces the general availability of Elastic Network Adapter (ENA) Express for Amazon Elastic Compute Cloud (EC2) instances. All current generation EC2 instances use ENA, a purpose-built network interface, to deliver an enhanced networking experience. ENA Express is a new ENA feature that uses the AWS Scalable Reliable Datagram (SRD) protocol to improve network performance in two key ways: higher single flow bandwidth and lower tail latency for network traffic between EC2 instances.