# Performance Review Report

**Branch**: feat/179-git-log-parser-gix -> main
**Date**: 2026-05-15
**Scope**: Incremental — 1 commit (bd7b8c1), 4 files, +34/-29 lines

## Issues in Your Changes (BLOCKING)

No blocking performance issues found.

## Issues in Code You Touched (Should Fix)

No should-fix performance issues found.

## Pre-existing Issues (Not Blocking)

No pre-existing performance issues found.

## Suggestions (Lower Confidence)

(none)

## Summary

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

**Performance Score**: 10/10
**Recommendation**: APPROVED

## Analysis Notes

This commit (`bd7b8c1`) is a **pure rename refactor**: it removes two type aliases (`CommitRecord` and `FileChange`) in `types.rs` and replaces all usages across `git_source.rs`, `metrics.rs`, and `mod.rs` with the canonical names (`CommitInfo` and `FileChangeInfo`) re-exported from `rskim_search`.

**Performance impact assessment:**

1. **Zero runtime impact** — Type aliases in Rust are erased at compile time. Replacing `CommitRecord` with `CommitInfo` and `FileChange` with `FileChangeInfo` produces identical machine code. There is no change to data layout, no change to function signatures at the binary level, and no additional indirection.

2. **No algorithmic changes** — The diff touches only type names in function signatures, struct construction sites, import statements, and doc comments. No control flow, data structures, or computation logic was modified.

3. **No new allocations** — No `.clone()`, `.to_string()`, or `Vec::new()` calls were added. The existing zero-copy patterns (`&str` borrows in `compute_coupling`, `path_str()` returning `Cow<str>`) remain unchanged.

4. **Parallel computation preserved** — The `rayon::join` tree in `compute_heatmap` (`mod.rs:429-447`) is untouched beyond the type annotation on the `commits` parameter.

**Minor non-performance observation**: The commit introduced a typo in a comment at `metrics.rs:78` — `FileChangeInfoInfo.path` (doubled "Info" suffix). This is cosmetic and does not affect performance or correctness.
