# Performance Review Report

**Branch**: fix/orchestrator-loop-termination -> main
**Date**: 2026-05-14

## Issues in Your Changes (BLOCKING)

### HIGH

**Sequential git commands in `enrichPromptWithGitContext` when parallel is possible** - `src/services/handlers/loop-handler.ts:1686-1687`
**Confidence**: 92%
- Problem: `getRecentGitLog` and `getRecentGitDiffStat` are independent async calls to `execFile('git', ...)` each with a `GIT_TIMEOUT_MS` timeout. They are awaited sequentially, meaning the total wall-clock time is the sum of both git commands rather than the max. Each git command spawns a child process and waits for it to complete.
- Impact: For every freshContext loop iteration > 1 with a working directory, the iteration start is delayed by the total of both git commands (~50-200ms typical, up to `GIT_TIMEOUT_MS * 2` worst case) instead of the max of the two.
- Fix: Use `Promise.all` to run both commands concurrently:
  ```typescript
  const [gitLogResult, gitDiffStatResult] = await Promise.all([
    getRecentGitLog(loop.workingDirectory, 15),
    getRecentGitDiffStat(loop.workingDirectory, 5),
  ]);
  ```

### MEDIUM

**`checkConvergence` adds a DB query on every non-terminal iteration** - `src/services/handlers/loop-handler.ts:1191-1192`
**Confidence**: 82%
- Problem: `checkConvergence` calls `this.loopRepo.getIterations(loop.id, CONVERGENCE_WINDOW, 0)` on every iteration that passes through `recordAndContinue` -> `checkTerminationConditions`. This is a new DB round-trip per iteration. The data it needs (recent iteration gitDiffSummary and score) was just written in the same `recordAndContinue` call, and the current iteration object is already in scope.
- Impact: One additional SQLite query per loop iteration. For loops with short iteration cycles or many iterations, this adds up. However, since loop iterations typically take seconds-to-minutes (agent eval or task execution), the overhead of a single indexed SQLite query is negligible in practice. The concern is more about the pattern than the actual latency.
- Fix: This is an acceptable trade-off given that iterations are not high-frequency. If optimization is desired later, the convergence check could maintain a small in-memory ring buffer of recent iteration results to avoid the DB call. No action required now.

## Issues in Code You Touched (Should Fix)

(none)

## Pre-existing Issues (Not Blocking)

(none)

## Suggestions (Lower Confidence)

- **Binary search truncation allocates intermediate arrays** - `src/services/handlers/loop-handler.ts:1704-1717` (Confidence: 65%) -- The binary search calls `lines.slice(0, mid).join('\n')` per iteration, allocating a new array and string each time (O(n log n) total). A prefix-sum approach on line byte lengths would reduce allocations to O(n) precomputation + O(log n) lookups, but the data is capped at 4KB so the practical benefit is negligible.

- **`checkConvergence` reason string construction reverses and joins array on convergence path** - `src/services/handlers/loop-handler.ts:1236` (Confidence: 62%) -- `[...changedLines].reverse().join(', ')` copies and reverses an array for the reason message. This only runs on the rare convergence path (not per-iteration), so it has zero practical impact. Cosmetic only.

## Summary

| Category | CRITICAL | HIGH | MEDIUM | LOW |
|----------|----------|------|--------|-----|
| Blocking | 0 | 1 | 1 | 0 |
| Should Fix | 0 | 0 | 0 | 0 |
| Pre-existing | 0 | 0 | 0 | 0 |

**Performance Score**: 8/10
**Recommendation**: APPROVED_WITH_CONDITIONS

The branch introduces well-bounded algorithms throughout (binary search with provable O(n log n), convergence window capped at 5 iterations, git context capped at 4KB). The binary search replacement for the O(n^2) truncation loop is a clear improvement. The new git utility functions use `execFile` (not `exec`) with timeouts, following the existing `git-state.ts` patterns.

The one actionable finding is the sequential `await` on two independent git commands in `enrichPromptWithGitContext`. Converting to `Promise.all` is a one-line change that halves the wall-clock cost of git context injection on every freshContext iteration > 1. The convergence DB query is acceptable overhead given iteration frequency.

No pitfall citations apply: PF-001 (deferral posture) and PF-002 (migration for unused features) are not relevant to this performance review.
