diff --git a/index.html b/index.html
index 219c5ee..521bbf9 100644
--- a/index.html
+++ b/index.html
@@ -70,6 +70,7 @@
     <script src="src/utils/SpatialGrid.js"></script>
     <script src="src/utils/Pathfinding.js"></script>
     <script src="src/utils/Compression.js"></script>
+    <script src="src/utils/PerformanceMonitor.js"></script>
 
     <!-- Data -->
     <script src="src/data/CraftingRecipes.js"></script>
diff --git a/src/utils/PerformanceMonitor.js b/src/utils/PerformanceMonitor.js
new file mode 100644
index 0000000..78ab2a1
--- /dev/null
+++ b/src/utils/PerformanceMonitor.js
@@ -0,0 +1,203 @@
+/**
+ * PERFORMANCE MONITOR
+ * Tracks FPS, memory usage, and performance metrics
+ */
+
+class PerformanceMonitor {
+    constructor(scene) {
+        this.scene = scene;
+        this.enabled = true; // Toggle with F3
+
+        // FPS tracking
+        this.fps = 60;
+        this.fpsHistory = [];
+        this.maxHistoryLength = 60; // 1 second at 60fps
+
+        // Memory tracking (if available)
+        this.memoryUsage = 0;
+
+        // Performance stats
+        this.stats = {
+            avgFPS: 60,
+            minFPS: 60,
+            maxFPS: 60,
+            frameTime: 16.67, // ms
+            drawCalls: 0,
+            activeSprites: 0
+        };
+
+        // Create UI
+        this.createUI();
+
+        // Keyboard toggle (F3)
+        if (scene.input && scene.input.keyboard) {
+            scene.input.keyboard.on('keydown-F3', () => {
+                this.toggle();
+            });
+        }
+    }
+
+    createUI() {
+        if (!this.scene.add) return;
+
+        // Background panel
+        this.panel = this.scene.add.rectangle(10, 10, 200, 120, 0x000000, 0.7);
+        this.panel.setOrigin(0, 0);
+        this.panel.setScrollFactor(0);
+        this.panel.setDepth(100000);
+
+        // Text display
+        this.text = this.scene.add.text(15, 15, '', {
+            fontSize: '12px',
+            fontFamily: 'Courier New',
+            color: '#00ff00',
+            stroke: '#000000',
+            strokeThickness: 2
+        });
+        this.text.setOrigin(0, 0);
+        this.text.setScrollFactor(0);
+        this.text.setDepth(100001);
+
+        // FPS graph (mini)
+        this.graph = this.scene.add.graphics();
+        this.graph.setScrollFactor(0);
+        this.graph.setDepth(100001);
+
+        this.updateVisibility();
+    }
+
+    toggle() {
+        this.enabled = !this.enabled;
+        this.updateVisibility();
+        console.log(`📊 Performance Monitor: ${this.enabled ? 'ON' : 'OFF'}`);
+    }
+
+    updateVisibility() {
+        if (this.panel) this.panel.setVisible(this.enabled);
+        if (this.text) this.text.setVisible(this.enabled);
+        if (this.graph) this.graph.setVisible(this.enabled);
+    }
+
+    update(delta) {
+        if (!this.enabled) return;
+
+        // Calculate FPS
+        this.fps = 1000 / delta;
+        this.fpsHistory.push(this.fps);
+        if (this.fpsHistory.length > this.maxHistoryLength) {
+            this.fpsHistory.shift();
+        }
+
+        // Calculate stats
+        this.stats.avgFPS = this.fpsHistory.reduce((a, b) => a + b, 0) / this.fpsHistory.length;
+        this.stats.minFPS = Math.min(...this.fpsHistory);
+        this.stats.maxFPS = Math.max(...this.fpsHistory);
+        this.stats.frameTime = delta;
+
+        // Count active sprites
+        this.stats.activeSprites = this.countActiveSprites();
+
+        // Memory (if available)
+        if (performance.memory) {
+            this.memoryUsage = (performance.memory.usedJSHeapSize / 1048576).toFixed(2); // MB
+        }
+
+        // Update UI every 5 frames (reduce overhead)
+        if (this.scene.game.loop.frame % 5 === 0) {
+            this.updateUI();
+        }
+    }
+
+    countActiveSprites() {
+        if (!this.scene.children) return 0;
+        return this.scene.children.list.filter(child =>
+            child.active && child.visible
+        ).length;
+    }
+
+    updateUI() {
+        if (!this.text) return;
+
+        // Build text
+        let lines = [
+            `FPS: ${this.fps.toFixed(1)}`,
+            `Avg: ${this.stats.avgFPS.toFixed(1)}`,
+            `Min: ${this.stats.minFPS.toFixed(1)} / Max: ${this.stats.maxFPS.toFixed(1)}`,
+            `Frame: ${this.stats.frameTime.toFixed(2)}ms`,
+            `Sprites: ${this.stats.activeSprites}`
+        ];
+
+        if (this.memoryUsage > 0) {
+            lines.push(`Memory: ${this.memoryUsage} MB`);
+        }
+
+        this.text.setText(lines.join('\n'));
+
+        // Update graph
+        this.drawGraph();
+    }
+
+    drawGraph() {
+        if (!this.graph) return;
+
+        this.graph.clear();
+
+        const graphX = 15;
+        const graphY = 100;
+        const graphWidth = 180;
+        const graphHeight = 20;
+        const maxFPS = 60;
+
+        // Draw background
+        this.graph.fillStyle(0x222222, 0.5);
+        this.graph.fillRect(graphX, graphY, graphWidth, graphHeight);
+
+        // Draw FPS bars
+        this.graph.fillStyle(0x00ff00, 0.8);
+
+        const barWidth = graphWidth / this.maxHistoryLength;
+        this.fpsHistory.forEach((fps, i) => {
+            const barHeight = (fps / maxFPS) * graphHeight;
+            const x = graphX + (i * barWidth);
+            const y = graphY + graphHeight - barHeight;
+
+            // Color based on FPS
+            if (fps < 30) {
+                this.graph.fillStyle(0xff0000, 0.8); // Red
+            } else if (fps < 50) {
+                this.graph.fillStyle(0xffaa00, 0.8); // Orange
+            } else {
+                this.graph.fillStyle(0x00ff00, 0.8); // Green
+            }
+
+            this.graph.fillRect(x, y, barWidth, barHeight);
+        });
+
+        // Draw 60 FPS line
+        this.graph.lineStyle(1, 0xffffff, 0.5);
+        this.graph.beginPath();
+        this.graph.moveTo(graphX, graphY);
+        this.graph.lineTo(graphX + graphWidth, graphY);
+        this.graph.strokePath();
+    }
+
+    // Get current stats for external use
+    getStats() {
+        return {
+            ...this.stats,
+            currentFPS: this.fps,
+            memoryMB: this.memoryUsage
+        };
+    }
+
+    destroy() {
+        if (this.panel) this.panel.destroy();
+        if (this.text) this.text.destroy();
+        if (this.graph) this.graph.destroy();
+    }
+}
+
+// Export
+if (typeof module !== 'undefined' && module.exports) {
+    module.exports = PerformanceMonitor;
+}