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Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Feb 15, 2026 1:44am

Greptile Overview

Greptile Summary

This PR implements comprehensive performance optimizations to eliminate re-render cascades in the logs page. The changes are well-structured and address multiple sources of unnecessary re-renders.

Key improvements:

• Replaced useState with useReducer for log selection state, providing a stable dispatch function that prevents callback recreation
• Stabilized all event handlers (handleLogClick, navigation, refresh, toggle live, export) using refs to read current values instead of closure captures
• Added execution data stabilization in Dashboard to reuse object references across polls when data hasn't structurally changed
• Memo-wrapped 7+ components with custom equality comparators where needed (StatusBar, WorkflowOutputSection)
• Fixed barrel exports that were bypassing memo wrappers by removing default exports
• Implemented proper timer cleanup with refreshTimersRef to prevent memory leaks and state updates after unmount
• Added hover prefetch for instant log detail panel rendering
• Changed refetchInterval to callback-based for smarter polling (only active logs)
• Removed dead code: unused refs, useAlertRule state, unnecessary type casts

Previously flagged issues acknowledged:
The PR description acknowledges the JSON.stringify performance concern in WorkflowOutputSection comparator and the initialData vs placeholderData trade-off in the query hook. These are acceptable for the current scale.

Confidence Score: 4/5

• This PR is safe to merge with minimal risk - the changes are defensive performance optimizations that don't alter business logic
• Score reflects thorough performance optimization work with proper patterns (useReducer, refs, memo). The changes are well-tested manually with React Scan profiling. Minor score reduction due to: 1) the custom comparators adding complexity that needs monitoring, 2) the acknowledged trade-offs in JSON.stringify and initialData patterns, and 3) lack of automated tests for the optimization behavior
• Pay attention to logs.tsx and dashboard.tsx - these contain the most complex state management changes. Monitor the custom areStatusBarPropsEqual comparator to ensure it remains in sync if StatusBarSegment interface changes

Important Files Changed

Flowchart

flowchart TD
    A[User Action] --> B{Action Type}
    
    B -->|Click Log| C[dispatch TOGGLE_LOG]
    B -->|Navigate| D[handleNavigateNext/Prev]
    B -->|Refresh| E[handleRefresh]
    B -->|Toggle Live| F[handleToggleLive]
    B -->|Hover Log| G[prefetchLogDetail]
    
    C --> H[useReducer updates state]
    D --> I[Read from logsRef.current]
    E --> J[Read from refs, start timer]
    F --> K[setIsLive updater, start timer]
    G --> L[QueryClient prefetch]
    
    H --> M[Stable dispatch prevents re-render]
    I --> M
    J --> N[refreshTimersRef tracks cleanup]
    K --> N
    L --> O[Instant panel on click]
    
    M --> P[Memoized components skip render]
    N --> Q[Cleanup on unmount]
    
    P --> R[StatusBar custom comparator]
    P --> S[Dashboard execution stabilization]
    
    R --> T[Structural segment comparison]
    S --> U[Reuse prev refs if data unchanged]
    
    T --> V[No re-render cascade]
    U --> V

_{Last reviewed commit: ca0105a}

@cursor review
@greptile

@cursor review

@cursor review
@greptile

@cursor review
@greptile