diff --git a/docs/performance-audit/API.md b/docs/performance-audit/API.md
new file mode 100644
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+++ b/docs/performance-audit/API.md
@@ -0,0 +1,503 @@
+# 📊 Performance Audit API Reference
+
+**Complete API documentation for the Performance Audit System**
+
+## 🎯 Overview
+
+The Performance Audit System provides both a command-line interface and a programmatic API for monitoring and optimizing leptos-shadcn-ui component performance.
+
+## 📦 Package Information
+
+- **Package**: `leptos-shadcn-performance-audit`
+- **Version**: `0.1.0`
+- **Crates.io**: [leptos-shadcn-performance-audit](https://crates.io/crates/leptos-shadcn-performance-audit)
+
+## 🚀 Quick Start
+
+### Installation
+```toml
+[dependencies]
+leptos-shadcn-performance-audit = "0.1.0"
+```
+
+### Basic Usage
+```rust
+use leptos_shadcn_performance_audit::{run_performance_audit, PerformanceConfig};
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let config = PerformanceConfig::default();
+    let results = run_performance_audit(config).await?;
+    
+    println!("Overall Score: {:.1}/100", results.overall_score);
+    println!("Grade: {}", results.get_grade());
+    
+    Ok(())
+}
+```
+
+## 🔧 Core API
+
+### Main Functions
+
+#### `run_performance_audit`
+Runs a comprehensive performance audit.
+
+```rust
+pub async fn run_performance_audit(
+    config: PerformanceConfig
+) -> Result<PerformanceResults, PerformanceAuditError>
+```
+
+**Parameters:**
+- `config: PerformanceConfig` - Performance audit configuration
+
+**Returns:**
+- `Result<PerformanceResults, PerformanceAuditError>` - Audit results or error
+
+**Example:**
+```rust
+use leptos_shadcn_performance_audit::{run_performance_audit, PerformanceConfig};
+
+let config = PerformanceConfig {
+    max_component_size_kb: 5.0,
+    max_render_time_ms: 16.0,
+    max_memory_usage_mb: 1.0,
+    monitoring_enabled: true,
+};
+
+let results = run_performance_audit(config).await?;
+```
+
+## 📊 Data Structures
+
+### `PerformanceConfig`
+Configuration for performance audits.
+
+```rust
+#[derive(Debug, Clone)]
+pub struct PerformanceConfig {
+    pub max_component_size_kb: f64,      // Default: 5.0
+    pub max_render_time_ms: f64,         // Default: 16.0
+    pub max_memory_usage_mb: f64,        // Default: 1.0
+    pub monitoring_enabled: bool,        // Default: true
+}
+```
+
+### `PerformanceResults`
+Complete performance audit results.
+
+```rust
+#[derive(Debug, Clone)]
+pub struct PerformanceResults {
+    pub bundle_analysis: BundleAnalysisResults,
+    pub performance_monitoring: PerformanceMonitoringResults,
+    pub optimization_roadmap: OptimizationRoadmap,
+    pub overall_score: f64,
+}
+
+impl PerformanceResults {
+    pub fn meets_targets(&self) -> bool;
+    pub fn get_grade(&self) -> char;
+}
+```
+
+### `BundleAnalysisResults`
+Bundle size analysis results.
+
+```rust
+#[derive(Debug, Clone)]
+pub struct BundleAnalysisResults {
+    pub component_analyses: BTreeMap<String, ComponentBundleAnalysis>,
+    pub total_bundle_size_bytes: u64,
+    pub total_bundle_size_kb: f64,
+    pub average_component_size_kb: f64,
+    pub largest_component_size_kb: f64,
+    pub oversized_components: Vec<String>,
+    pub overall_efficiency_score: f64,
+}
+```
+
+### `ComponentBundleAnalysis`
+Individual component bundle analysis.
+
+```rust
+#[derive(Debug, Clone)]
+pub struct ComponentBundleAnalysis {
+    pub component_name: String,
+    pub bundle_size_bytes: u64,
+    pub bundle_size_kb: f64,
+    pub is_oversized: bool,
+    pub performance_score: f64,
+    pub optimization_recommendations: Vec<String>,
+}
+```
+
+### `PerformanceMonitoringResults`
+Performance monitoring results.
+
+```rust
+#[derive(Debug, Clone)]
+pub struct PerformanceMonitoringResults {
+    pub component_metrics: BTreeMap<String, ComponentPerformanceMetrics>,
+    pub monitoring_duration: Duration,
+    pub overall_performance_score: f64,
+    pub failing_components: Vec<String>,
+    pub performance_bottlenecks: Vec<String>,
+}
+```
+
+### `ComponentPerformanceMetrics`
+Individual component performance metrics.
+
+```rust
+#[derive(Debug, Clone)]
+pub struct ComponentPerformanceMetrics {
+    pub component_name: String,
+    pub render_times: Vec<Duration>,
+    pub memory_usage: Vec<u64>,
+    pub performance_score: f64,
+    pub meets_targets: bool,
+}
+```
+
+### `OptimizationRoadmap`
+Optimization recommendations and roadmap.
+
+```rust
+#[derive(Debug, Clone)]
+pub struct OptimizationRoadmap {
+    pub recommendations: Vec<OptimizationRecommendation>,
+    pub total_estimated_effort_hours: f64,
+    pub total_expected_impact_percent: f64,
+    pub overall_roi_score: f64,
+}
+```
+
+### `OptimizationRecommendation`
+Individual optimization recommendation.
+
+```rust
+#[derive(Debug, Clone)]
+pub struct OptimizationRecommendation {
+    pub title: String,
+    pub description: String,
+    pub category: OptimizationCategory,
+    pub priority: OptimizationPriority,
+    pub estimated_effort_hours: f64,
+    pub expected_impact_percent: f64,
+    pub roi_score: f64,
+}
+```
+
+### Enums
+
+#### `OptimizationCategory`
+```rust
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub enum OptimizationCategory {
+    BundleSize,
+    Performance,
+    MemoryUsage,
+    CodeQuality,
+    Dependencies,
+}
+```
+
+#### `OptimizationPriority`
+```rust
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub enum OptimizationPriority {
+    Critical,
+    High,
+    Medium,
+    Low,
+}
+```
+
+## 🛠️ Bundle Analysis API
+
+### `BundleAnalyzer`
+Analyzes component bundle sizes.
+
+```rust
+pub struct BundleAnalyzer {
+    pub components_path: PathBuf,
+}
+
+impl BundleAnalyzer {
+    pub fn new(components_path: PathBuf) -> Self;
+    
+    pub async fn analyze_all_components(&self) -> BundleAnalysisResults;
+    
+    pub async fn analyze_component(&self, name: &str) -> ComponentBundleAnalysis;
+    
+    pub async fn get_component_bundle_size(&self, name: &str) -> u64;
+}
+```
+
+**Example:**
+```rust
+use leptos_shadcn_performance_audit::bundle_analysis::BundleAnalyzer;
+use std::path::PathBuf;
+
+let analyzer = BundleAnalyzer::new(PathBuf::from("packages/leptos"));
+let results = analyzer.analyze_all_components().await;
+```
+
+## ⚡ Performance Monitoring API
+
+### `PerformanceMonitor`
+Monitors component performance in real-time.
+
+```rust
+pub struct PerformanceMonitor {
+    pub config: PerformanceConfig,
+    pub start_time: Option<Instant>,
+    pub tracked_components: BTreeMap<String, ComponentPerformanceMetrics>,
+}
+
+impl PerformanceMonitor {
+    pub fn new(config: PerformanceConfig) -> Self;
+    
+    pub fn start_monitoring(&mut self);
+    
+    pub fn stop_monitoring(&mut self) -> PerformanceMonitoringResults;
+    
+    pub fn record_render_time(&mut self, component: &str, duration: Duration);
+    
+    pub fn record_memory_usage(&mut self, component: &str, usage: u64);
+    
+    pub fn is_monitoring(&self) -> bool;
+}
+```
+
+**Example:**
+```rust
+use leptos_shadcn_performance_audit::performance_monitoring::PerformanceMonitor;
+use std::time::Duration;
+
+let mut monitor = PerformanceMonitor::new(PerformanceConfig::default());
+monitor.start_monitoring();
+
+// Record some metrics
+monitor.record_render_time("button", Duration::from_millis(8));
+monitor.record_memory_usage("button", 512 * 1024);
+
+let results = monitor.stop_monitoring();
+```
+
+## 🗺️ Optimization Roadmap API
+
+### `OptimizationRoadmapGenerator`
+Generates optimization recommendations.
+
+```rust
+pub struct OptimizationRoadmapGenerator;
+
+impl OptimizationRoadmapGenerator {
+    pub fn generate_roadmap(
+        bundle_results: &BundleAnalysisResults,
+        performance_results: &PerformanceMonitoringResults,
+    ) -> OptimizationRoadmap;
+}
+```
+
+**Example:**
+```rust
+use leptos_shadcn_performance_audit::optimization_roadmap::OptimizationRoadmapGenerator;
+
+let roadmap = OptimizationRoadmapGenerator::generate_roadmap(
+    &bundle_results,
+    &performance_results,
+);
+```
+
+## 📈 Benchmarking API
+
+### `BenchmarkRunner`
+Runs performance benchmarks.
+
+```rust
+pub struct BenchmarkRunner {
+    pub config: BenchmarkConfig,
+    pub benchmarks: HashMap<String, Box<dyn Benchmark>>,
+}
+
+impl BenchmarkRunner {
+    pub fn new(config: BenchmarkConfig) -> Self;
+    
+    pub fn register_benchmark(&mut self, name: String, benchmark: Box<dyn Benchmark>);
+    
+    pub async fn run_benchmark(&self, name: &str) -> BenchmarkResult;
+    
+    pub async fn run_all_benchmarks(&self) -> BenchmarkSuiteResults;
+}
+```
+
+### `BenchmarkConfig`
+```rust
+#[derive(Debug, Clone)]
+pub struct BenchmarkConfig {
+    pub iterations: usize,           // Default: 100
+    pub warmup_iterations: usize,    // Default: 10
+    pub timeout: Duration,           // Default: 30s
+}
+```
+
+## ❌ Error Handling
+
+### `PerformanceAuditError`
+Custom error types for the performance audit system.
+
+```rust
+#[derive(Error, Debug)]
+pub enum PerformanceAuditError {
+    #[error("Bundle analysis failed: {0}")]
+    BundleAnalysisError(String),
+    
+    #[error("Performance monitoring failed: {0}")]
+    PerformanceMonitoringError(String),
+    
+    #[error("Optimization roadmap generation failed: {0}")]
+    OptimizationRoadmapError(String),
+    
+    #[error("Configuration error: {0}")]
+    ConfigurationError(String),
+    
+    #[error("IO error: {0}")]
+    IoError(#[from] std::io::Error),
+}
+```
+
+**Example:**
+```rust
+use leptos_shadcn_performance_audit::PerformanceAuditError;
+
+match run_performance_audit(config).await {
+    Ok(results) => println!("Audit completed: {:.1}/100", results.overall_score),
+    Err(PerformanceAuditError::BundleAnalysisError(msg)) => {
+        eprintln!("Bundle analysis failed: {}", msg);
+    },
+    Err(e) => eprintln!("Audit failed: {}", e),
+}
+```
+
+## 🧪 Testing API
+
+### Test Utilities
+The performance audit system includes comprehensive test utilities.
+
+```rust
+// Test configuration
+let config = PerformanceConfig::default();
+
+// Test with mock data
+let results = run_performance_audit(config).await?;
+
+// Assertions
+assert!(results.overall_score >= 0.0 && results.overall_score <= 100.0);
+assert!(results.bundle_analysis.overall_efficiency_score >= 0.0);
+assert!(results.performance_monitoring.overall_performance_score >= 0.0);
+```
+
+## 🔧 CLI Integration
+
+### Programmatic CLI Usage
+You can also use the CLI programmatically:
+
+```rust
+use std::process::Command;
+
+let output = Command::new("performance-audit")
+    .arg("audit")
+    .arg("--format")
+    .arg("json")
+    .output()?;
+
+let results: serde_json::Value = serde_json::from_slice(&output.stdout)?;
+```
+
+## 📚 Examples
+
+### Complete Audit Example
+```rust
+use leptos_shadcn_performance_audit::{
+    run_performance_audit, 
+    PerformanceConfig,
+    PerformanceAuditError
+};
+
+#[tokio::main]
+async fn main() -> Result<(), PerformanceAuditError> {
+    // Configure performance targets
+    let config = PerformanceConfig {
+        max_component_size_kb: 5.0,
+        max_render_time_ms: 16.0,
+        max_memory_usage_mb: 1.0,
+        monitoring_enabled: true,
+    };
+    
+    // Run comprehensive audit
+    let results = run_performance_audit(config).await?;
+    
+    // Display results
+    println!("📊 Performance Audit Results");
+    println!("Overall Score: {:.1}/100 ({})", results.overall_score, results.get_grade());
+    println!("Meets Targets: {}", if results.meets_targets() { "✅ Yes" } else { "❌ No" });
+    
+    // Bundle analysis
+    println!("\n📦 Bundle Analysis:");
+    println!("  Overall Efficiency: {:.1}%", results.bundle_analysis.overall_efficiency_score);
+    println!("  Total Size: {:.1} KB", results.bundle_analysis.total_bundle_size_kb);
+    println!("  Average Component Size: {:.1} KB", results.bundle_analysis.average_component_size_kb);
+    
+    // Performance monitoring
+    println!("\n⚡ Performance Monitoring:");
+    println!("  Overall Score: {:.1}%", results.performance_monitoring.overall_performance_score);
+    println!("  Failing Components: {}", results.performance_monitoring.failing_components.len());
+    
+    // Optimization roadmap
+    println!("\n🗺️ Optimization Roadmap:");
+    println!("  Total Recommendations: {}", results.optimization_roadmap.recommendations.len());
+    println!("  Estimated Effort: {:.1} hours", results.optimization_roadmap.total_estimated_effort_hours);
+    println!("  Expected Impact: {:.1}%", results.optimization_roadmap.total_expected_impact_percent);
+    
+    Ok(())
+}
+```
+
+### Custom Monitoring Example
+```rust
+use leptos_shadcn_performance_audit::performance_monitoring::PerformanceMonitor;
+use std::time::{Duration, Instant};
+
+let mut monitor = PerformanceMonitor::new(PerformanceConfig::default());
+monitor.start_monitoring();
+
+// Simulate component rendering
+let start = Instant::now();
+// ... render component ...
+let render_time = start.elapsed();
+
+monitor.record_render_time("my-component", render_time);
+monitor.record_memory_usage("my-component", 1024 * 1024); // 1MB
+
+let results = monitor.stop_monitoring();
+println!("Component performance score: {:.1}", results.overall_performance_score);
+```
+
+## 📖 Additional Resources
+
+- **[Quick Start Guide](QUICK_START.md)** - Get started in 5 minutes
+- **[Complete Documentation](README.md)** - Full system documentation
+- **[CLI Reference](CLI.md)** - Command-line interface documentation
+- **[Examples](../examples/)** - Working code examples
+
+## 🤝 Contributing
+
+We welcome contributions to the API! Please see our [Contributing Guide](../../CONTRIBUTING.md) for details.
+
+---
+
+**🎯 Build powerful performance monitoring into your Leptos applications with the Performance Audit API!**
diff --git a/docs/performance-audit/README.md b/docs/performance-audit/README.md
index 37d34ca..557afba 100644
--- a/docs/performance-audit/README.md
+++ b/docs/performance-audit/README.md
@@ -407,6 +407,12 @@ cargo run -p leptos-shadcn-performance-audit --bin performance-audit -- --help
 
 This project is licensed under the MIT License - see the [LICENSE](../../LICENSE) file for details.
 
+## 📚 Additional Resources
+
+- **[Quick Start Guide](QUICK_START.md)** - Get started in 5 minutes
+- **[API Reference](API.md)** - Complete programmatic API documentation
+- **[Examples](../../examples/)** - Working code examples
+
 ---
 
 **🎯 Monitor, Optimize, and Scale your Leptos applications with the Performance Audit System!**