Amazon DynamoDB was designed for performance and scale. Most cases, DynamoDB response times are measured in single-digit milliseconds. Some use cases, however, require response times of microseconds. DynamoDB Accelerator, (DAX), provides fast response times to allow users to access eventually consistent data. DAX is an API-compatible managed service that can be used with DynamoDB. This reduces application and operational complexity. It requires minimal functional changes to be used with existing applications. DAX is a great choice for read-heavy workloads. It can increase throughput and potentially save you money by reducing the need for overprovisioning read capacity units. This is especially useful for applications that require multiple reads of individual keys.