The Performance Efficiency pillar of the AWS Well-Architected Framework focuses on using computing resources efficiently to meet system requirements and maintain that efficiency as demand changes and technologies evolve. This includes:

• Structured allocation of resources: Properly selecting and configuring compute, storage, and networking resources
• Streamlined resource management: Optimizing resource utilization to avoid over-provisioning or under-provisioning
• Monitoring and scaling: Implementing auto-scaling and performance monitoring
• Technology selection: Choosing appropriate instance types and services for specific workloads

The other pillars address different aspects:

• Reliability: Ensuring systems recover from failures and meet availability requirements
• Operational Excellence: Running and monitoring systems to deliver business value
• Sustainability: Minimizing environmental impacts of cloud workloads