# 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
rustc-hash = "1.1"
use rustc_hash::FxHashMap;
```
2. **Parallel File Processing**
```rust
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
| 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 |