I am using an EC2 micro server with PHP and an RDS 2xlarge server with MySQL. During periods of high traffic, the system experiences slowdowns, but the CPU and memory usage on the EC2 instance are still within comfortable limits. The CPU and memory on the RDS instance are also very underutilized. However, the web server becomes extremely slow. I am using Nginx as the web server engine. I am not sure what the cause could be.