Build Performance Optimization

Overview

Systematic Xcode build performance analysis and optimization. Core principle: Measure before optimizing, then optimize the critical path first.

When to Use This Skill

• Build times have increased significantly
• Incremental builds taking too long
• Want to analyze Build Timeline
• Need to identify slow-compiling Swift code
• Optimizing CI/CD build times
• Build performance regression investigation
• Enabling Xcode 26 compilation caching
• Reducing module variants in explicitly built modules
• Understanding the three-phase build process (scan → modules → compile)

Quick Win: Run the Agent First