Performance Engineering Standards

Priority: P0 (CRITICAL)

Workflow

1. Baseline: Profile before changing anything, measure CPU, memory, and latency.
2. Identify: Find top bottleneck (N+1 query, hot loop, memory leak).
3. Fix: Apply targeted optimization from sections below.
4. Verify: Re-profile to confirm improvement and check for regressions.

Resource Management

• Memory Efficiency:
• Avoid memory leaks: explicit cleanup of listeners, observers, and streams.
• Optimize data structures: Set for lookups, List for iteration.
• Lazy Initialization: Initialize expensive objects only when needed.
• CPU Optimization:
• Aim for O(1) or O(n); avoid O(n^2) in critical paths.
• Offload heavy computations to background threads or workers.
• Memoize pure, expensive functions.

See implementation examples for memoization and batching patterns.

Network & I/O

• Payload Reduction: Use efficient serialization (Protobuf, JSON minification) and compression (gzip/br).
• Batching: Group multiple small requests into single bulk operations.
• Caching: Implement multi-level caching (Memory -> Storage -> Network) with appropriate TTL and invalidation.
• Non-blocking I/O: Always use asynchronous operations for file system and network access.

UI/UX Performance

• Minimize Main Thread Work: Keep animations and interactions fluid by offloading to workers.
• Virtualization: Use lazy loading or virtualization for long lists/large datasets.
• Tree Shaking: Ensure build tools remove unused code and dependencies.

Monitoring & Testing