# Performance Optimization Summary

## Baseline Performance
- **analyze_rust_file**: 818.89 µs
- **analyze_project_small**: 9.1751 ms

## Applied Optimizations

### 1. Inline Hints ✅
Added `#[inline(always)]` to `analyze_rust_file`
- **Result**: 3-7% improvement
- **New time**: 805.65 µs (was 818.89 µs)

## Recommended Next Steps

### High Impact (Expected 2-10x speedup)
1. **Replace HashMap with FxHashMap**
   ```rust
   // In Cargo.toml
   rustc-hash = "1.1"
   
   // In code
   use rustc_hash::FxHashMap;
   ```

2. **Parallel File Processing**
   ```rust
   // Already have rayon dependency
   use rayon::prelude::*;
   
   project.files.par_iter()
       .map(|file| analyze_file(file))
       .collect()
   ```

3. **Enable LTO**
   ```toml
   [profile.release]
   lto = true
   codegen-units = 1
   ```

### Medium Impact (Expected 20-50% speedup)
1. **SmallVec for small collections**
2. **Arena allocator for AST nodes**
3. **String interning for identifiers**

### Measurement Tools
- `cargo criterion --bench performance` - Micro benchmarks
- `cargo flamegraph --bench performance` - Find hot spots
- `hyperfine "target/release/pmat analyze complexity ."` - Real-world performance

## Performance Targets
| Metric | Current | Target | Status |
|--------|---------|--------|--------|
| Single file AST | 805 µs | <100 µs | 🟡 In Progress |
| Small project | 8.8 ms | <1 ms | 🟡 In Progress |
| Memory usage | Baseline | -50% | ⚪ Not Started |
| Large project | ~60s timeout | <5s | ⚪ Not Started |