# Performance Audit Report

**Branch**: refactor/bootstrap-extraction
**Base**: main
**Date**: 2025-12-15 21:53:00
**Files Analyzed**: 3
**Lines Changed**: +460 / -147 (net +313)

---

## Executive Summary

This PR extracts handler setup logic from `bootstrap.ts` into a dedicated `handler-setup.ts` module. The refactor is **performance-neutral** with no algorithmic changes. The code restructuring introduces minimal overhead from additional function calls and object creation, which is negligible during the one-time bootstrap phase.

---

## Category 1: Performance Issues in Your Changes (BLOCKING if Severe)

### No Critical Issues Found

The changes in this branch do not introduce any significant performance regressions.

---

## Category 2: Performance Issues in Code You Touched (Should Optimize)

### MEDIUM - Sequential Dependency Extraction Pattern

**File**: `/workspace/delegate/src/services/handler-setup.ts:82-127` (lines ADDED in this branch)

**Problem**: The `extractHandlerDependencies()` function extracts 10 dependencies sequentially with individual Result checks, creating intermediate objects for each.

**Code**:
```typescript
export function extractHandlerDependencies(
  container: Container
): Result<HandlerDependencies> {
  // Extract all 10 dependencies - fail fast on any missing
  const configResult = getDependency<Configuration>(container, 'config');
  if (!configResult.ok) return configResult;

  const loggerResult = getDependency<Logger>(container, 'logger');
  if (!loggerResult.ok) return loggerResult;

  // ... 8 more sequential extractions
}
```

**Impact**: Minimal (microseconds) - only runs once at startup. Creates 10 intermediate Result objects before constructing the final HandlerDependencies object.

**Why Not Blocking**: This is a one-time startup cost, not a hot path. The sequential fail-fast pattern provides better error messages. The performance impact is unmeasurable in practice.

**Alternative Pattern** (not recommended to change):
A batch extraction pattern could reduce object allocations, but would sacrifice error specificity:
```typescript
// Theoretical alternative - NOT recommended
const keys = ['config', 'logger', ...];
const results = keys.map(k => container.get(k));
const firstError = results.find(r => !r.ok);
if (firstError) return firstError;
```

**Recommendation**: Keep current implementation. Clarity and error specificity outweigh micro-optimization.

---

### LOW - Child Logger Creation in Loop-like Pattern

**File**: `/workspace/delegate/src/services/handler-setup.ts:149-192` (lines ADDED in this branch)

**Problem**: Creates 6 child loggers via helper function, each involving a closure and object creation.

**Code**:
```typescript
const childLogger = (module: string) => logger.child({ module });

const standardHandlers = [
  new PersistenceHandler(
    deps.taskRepository,
    childLogger('PersistenceHandler')  // Creates child logger
  ),
  // ... 5 more handlers
];
```

**Impact**: Negligible - 6 child logger creations at startup. Each `logger.child()` creates a new logger instance with merged context.

**Why Not Blocking**: Runs once at bootstrap, not in hot path. Child logger pattern is idiomatic and provides valuable context for debugging.

**Recommendation**: No change needed. This is standard structured logging practice.

---

### LOW - Array Instantiation for Handler Registration

**File**: `/workspace/delegate/src/services/handler-setup.ts:154-193` (lines ADDED in this branch)

**Problem**: Creates an array of 6 handler instances before passing to registry.

**Code**:
```typescript
const standardHandlers = [
  new PersistenceHandler(...),
  new QueryHandler(...),
  // ... 4 more handlers
];

const registerResult = registry.registerAll(standardHandlers);
```

**Impact**: Minimal - allocates one array with 6 elements.

**Why Not Blocking**: Single allocation at startup. The array provides clear grouping and enables batch registration. Alternative of individual `register()` calls would be more verbose with no performance benefit.

---

## Category 3: Pre-existing Performance Issues (Not Blocking)

### INFO - Sequential Handler Initialization in EventHandlerRegistry

**File**: `/workspace/delegate/src/core/events/handlers.ts:136-159` (pre-existing, not changed)

**Problem**: `initialize()` method sets up handlers sequentially with await in loop.

**Code**:
```typescript
async initialize(): Promise<Result<void>> {
  for (const handler of this.handlers) {
    if ('setup' in handler && typeof handler.setup === 'function') {
      const result = await handler.setup(this.eventBus);
      if (!result.ok) {
        return result;
      }
    }
  }
  // ...
}
```

**Impact**: Linear time O(n) where n = number of handlers. With 7 handlers, this is negligible.

**Context**: Could theoretically use `Promise.all()` for parallel initialization, but sequential initialization is intentional - handlers may have implicit ordering requirements and sequential setup provides deterministic error handling.

**Recommendation**: No change. Sequential initialization is safer and the performance difference is unmeasurable for 7 handlers.

---

### INFO - Duplicate Container Lookups Eliminated

**File**: Original `bootstrap.ts` (pre-existing issue FIXED by this PR)

**Observation**: The original code in `bootstrap.ts` had redundant container lookups:
```typescript
// OLD CODE (removed by this PR):
const loggerResult2 = getFromContainerSafe<Logger>(container, 'logger');
const outputCaptureResult = getFromContainerSafe<OutputCapture>(container, 'outputCapture');
const outputCapture2Result = getFromContainerSafe<OutputCapture>(container, 'outputCapture');  // Duplicate!
```

**Impact**: This PR actually **improves** performance marginally by eliminating duplicate lookups. The `extractHandlerDependencies()` function extracts each service exactly once.

---

## Test Performance Analysis

**File**: `/workspace/delegate/tests/unit/services/handler-setup.test.ts` (NEW)

### Observations

1. **Database Per Test**: Each test creates a temporary SQLite database. This is appropriate for isolation but adds I/O overhead.

2. **Full Container Setup**: Each test sets up a complete container with all services. For unit tests, mocking dependencies would be faster.

3. **Cleanup in afterEach**: Proper cleanup with `eventBus.dispose()`, `database.close()`, and temp directory removal.

**Test Performance Rating**: Acceptable. The tests prioritize correctness over speed, which is appropriate for a new module.

---

## Summary

**Your Changes:**
- CRITICAL: 0
- HIGH: 0
- MEDIUM: 1 (sequential extraction - acceptable)
- LOW: 2 (child loggers, array allocation - idiomatic patterns)

**Code You Touched:**
- N/A (all code is new)

**Pre-existing:**
- INFO: 2 (sequential init - intentional design, duplicate lookups - fixed by this PR)

**Performance Score**: 9/10

The code follows performance best practices:
- Fail-fast error handling reduces wasted work
- One-time initialization cost, not in hot paths
- No algorithmic complexity issues (all O(n) where n is small and constant)
- Eliminates redundancy from original bootstrap code

---

## Merge Recommendation

**APPROVED**

This refactor is performance-neutral with clean architecture. The minor overhead from additional function calls and object creation is unmeasurable in practice since it only runs once at application startup.

**Rationale**:
1. No hot-path performance regressions
2. Bootstrap is one-time cost, not user-facing latency
3. Code clarity improvements outweigh micro-optimization concerns
4. Eliminates duplicate container lookups from original code
5. Enables future handler additions without modifying bootstrap.ts

---

## Optimization Priority

**Fix before merge:**
- None required

**Optimize while you're here:**
- None recommended (current patterns are idiomatic)

**Future work:**
- Consider lazy handler initialization if startup time becomes critical
- Profile bootstrap time if adding many more handlers in v0.4.0
