swiftui-performancelisted

# SwiftUI Performance Audit SwiftUI view performance end-to-end, from instrumentation and baselining to root-cause analysis and concrete remediation steps. ## Contents - [Workflow Decision Tree](#workflow-decision-tree) - [1. Code-First Review](#1-code-first-review) - [2. Guide the User to Profile](#2-guide-the-user-to-profile) - [3. Analyze and Diagnose](#3-analyze-and-diagnose) - [4. Remediate](#4-remediate) - [Common Code Smells (and Fixes)](#common-code-smells-and-fixes) - [5. Verify](#5-verify) - [Outputs](#outputs) - [Instruments Profiling](#instruments-profiling) - [Identity and Lifetime](#identity-and-lifetime) - [Lazy Loading Patterns](#lazy-loading-patterns) - [State and Observation Optimization](#state-and-observation-optimization) - [Common Mistakes](#common-mistakes) - [Review Checklist](#review-checklist) - [References](#references) ## Workflow Decision Tree - If the user provides code, start with "Code-First Review." - If the user only describes symptoms, ask for minimal code/context, then do "Code-First Review." - If code review is inconclusive, go to "Guide the User to Profile" and ask for a trace or screenshots. ## 1. Code-First Review Collect: - Target view/feature code. - Data flow: state, environment, observable models. - Symptoms and reproduction steps. Focus on: - View invalidation storms from broad state changes. - Unstable identity in lists (`id` churn, `UUID()` per render). - Top-level conditional view swapping (`if/else` returning different