AWS RDS caching query results

The first place to look when attempting to speed query performance when running AWS RDS MySQL is the MySQL query cache size:
http://survivalguides.wordpress.com/2012/07/11/change-the-query-cache-size-amazon-aws-rds/

With support of MySQL 5.6 for AWS RDS, MySQL RDS now has support for memcached:
http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Appendix.MySQL.Options.html

Memcache on AWS

ElastiCache is protocol-compliant with Memcached. Therefore, you can use standard Memcached operations likeget, set, incr and decr in exactly the same way as you would in your existing Memcached deployments.   Existing applications do not need to change and can simple 'pointed at' the ElastiCache service.  ElastiCache is exposed at the same port (11211) as default memcache port.  To configure and manage the cache servers for your application, you will need to use the AWS Management Console, CLI, SDK, or web services.