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💼 PERF01-BP04 Evaluate how trade-offs impact customers and architecture efficiency

• ID: /frameworks/aws-well-architected/performance-efficiency/architecture-selection/bp04

Description

When evaluating performance-related improvements, determine which choices impact your customers and workload efficiency. For example, if using a key-value data store increases system performance, it is important to evaluate how the eventually consistent nature of this change will impact customers.

Common anti-patterns:

• You assume that all performance gains should be implemented, even if there are tradeoffs for implementation.
• You only evaluate changes to workloads when a performance issue has reached a critical point.

Benefits of establishing this best practice: When you are evaluating potential performance-related improvements, you must decide if the tradeoffs for the changes are acceptable with the workload requirements. In some cases, you may have to implement additional controls to compensate for the tradeoffs.

Level of risk exposed if this best practice is not established: High

Implementation guidance

Identify critical areas in your architecture in terms of performance and customer impact. Determine how you can make improvements, what trade-offs those improvements bring, and how they impact the system and the user experience. For example, implementing caching data can help dramatically improve performance but requires a clear strategy for how and when to update or invalidate cached data to prevent incorrect system behavior.

Implementation steps

• Understand your workload requirements and SLAs.
• Clearly define evaluation factors. Factors may relate to cost, reliability, security, and performance of your workload.
• Select architecture and services that can address your requirements.
• Conduct experimentation and proof of concepts (POCs) to evaluate trade-off factors and impact on customers and architecture efficiency. Usually, highly-available, performant, and secure workloads consume more cloud resources while providing better customer experience. Understand the trade-offs across your workload’s complexity, performance, and cost. Typically, prioritizing two of the factors comes at the expense of the third.

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