title: Amazon RDS: PostgreSQL Performance Poor
body: <p>We use postgresql as a backend for Apache. We are planning to migrate our PostgreSQL from an EC2 instance (m1.xlarge +500GB volume/Ubuntu) to RDS.  However, in our testing on the same sized instance (m1.xlarge) on RDS the performance is dramatically slower (perhaps a third of the EC2 instance).</p>
  
  <p>Both instances are in the same availability zone as the Apache server.  Considering that the RDS instance will cost almost double of the EC2 instance, what steps or configuration changes should I try to boost the performance of the RDS instance? There are some hints to creating a VPC into which both the web server and RDS instance should be dropped. Does the VPC idea have legs?</p>
  
  <p>Thanks in advance.</p>