diff --git a/aocsync.py b/aocsync.py
index dc10cee..ef4f948 100755
--- a/aocsync.py
+++ b/aocsync.py
@@ -832,6 +832,97 @@ class HTMLGenerator:
         
         logger.info(f"Generated HTML report: {output_file}")
     
+    @staticmethod
+    def _generate_svg_graph(data_points: List[dict]) -> str:
+        """Generate an SVG line graph showing performance over time"""
+        if len(data_points) < 2:
+            return ""
+        
+        # Graph dimensions
+        width = 600
+        height = 200
+        padding = 40
+        graph_width = width - 2 * padding
+        graph_height = height - 2 * padding
+        
+        # Extract time values
+        times = [dp['time_ns'] for dp in data_points]
+        min_time = min(times)
+        max_time = max(times)
+        # Add 10% padding to range for better visualization, or minimum 1% of max value
+        time_range = max_time - min_time if max_time > min_time else max(max_time * 0.01, 1)
+        if time_range > 0:
+            padding_amount = time_range * 0.1
+            min_time = max(0, min_time - padding_amount)
+            max_time = max_time + padding_amount
+            time_range = max_time - min_time
+        
+        # Format time for display
+        def format_time(ns):
+            ms = ns / 1_000_000
+            us = ns / 1_000
+            if ms >= 1:
+                return f"{ms:.2f}ms"
+            elif us >= 1:
+                return f"{us:.2f}μs"
+            else:
+                return f"{ns}ns"
+        
+        # Generate SVG
+        svg_parts = []
+        svg_parts.append(f'<svg width="{width}" height="{height}" style="border: 1px solid #ddd; background: #fafafa;">')
+        
+        # Draw axes
+        svg_parts.append(f'<line x1="{padding}" y1="{padding}" x2="{padding}" y2="{height - padding}" stroke="#333" stroke-width="2"/>')  # Y-axis
+        svg_parts.append(f'<line x1="{padding}" y1="{height - padding}" x2="{width - padding}" y2="{height - padding}" stroke="#333" stroke-width="2"/>')  # X-axis
+        
+        # Draw grid lines and labels
+        num_grid_lines = 5
+        for i in range(num_grid_lines + 1):
+            y_pos = padding + (graph_height * i / num_grid_lines)
+            time_val = max_time - (time_range * i / num_grid_lines)
+            
+            # Grid line
+            if i < num_grid_lines:
+                svg_parts.append(f'<line x1="{padding}" y1="{y_pos}" x2="{width - padding}" y2="{y_pos}" stroke="#e0e0e0" stroke-width="1"/>')
+            
+            # Y-axis label
+            svg_parts.append(f'<text x="{padding - 5}" y="{y_pos + 4}" text-anchor="end" font-size="10" fill="#666">{format_time(time_val)}</text>')
+        
+        # Draw data points and line
+        points = []
+        for i, dp in enumerate(data_points):
+            x = padding + (graph_width * i / (len(data_points) - 1)) if len(data_points) > 1 else padding
+            y = padding + graph_height - (graph_height * (dp['time_ns'] - min_time) / time_range)
+            points.append((x, y))
+        
+        # Draw line connecting points
+        if len(points) > 1:
+            path_d = f"M {points[0][0]} {points[0][1]}"
+            for x, y in points[1:]:
+                path_d += f" L {x} {y}"
+            svg_parts.append(f'<path d="{path_d}" fill="none" stroke="#667eea" stroke-width="2"/>')
+        
+        # Draw points
+        for x, y in points:
+            svg_parts.append(f'<circle cx="{x}" cy="{y}" r="4" fill="#667eea" stroke="#fff" stroke-width="2"/>')
+        
+        # X-axis labels (show first, middle, last)
+        if len(data_points) > 0:
+            indices_to_label = [0]
+            if len(data_points) > 2:
+                indices_to_label.append(len(data_points) // 2)
+            if len(data_points) > 1:
+                indices_to_label.append(len(data_points) - 1)
+            
+            for idx in indices_to_label:
+                x = padding + (graph_width * idx / (len(data_points) - 1)) if len(data_points) > 1 else padding
+                date_str = data_points[idx]['date'][:10] if data_points[idx]['date'] else ''
+                svg_parts.append(f'<text x="{x}" y="{height - padding + 15}" text-anchor="middle" font-size="9" fill="#666">{date_str}</text>')
+        
+        svg_parts.append('</svg>')
+        return ''.join(svg_parts)
+    
     def _generate_html(self, data: dict, years: List[int], users: List[str], db: Database) -> str:
         """Generate HTML content"""
         # Sort years descending (most recent first)
@@ -1119,6 +1210,13 @@ class HTMLGenerator:
             border-bottom: none;
         }}
         
+        .history-graph {{
+            margin: 15px 0;
+            padding: 10px;
+            background: white;
+            border-radius: 4px;
+        }}
+        
         .summary {{
             margin-top: 30px;
             padding: 15px;
@@ -1347,7 +1445,8 @@ class HTMLGenerator:
                         history_link = ""
                         if len(historical) > 1:
                             history_items = []
-                            for hist in historical[:10]:  # Show last 10 runs
+                            hist_data_points = []
+                            for hist in historical[:20]:  # Show last 20 runs for graph
                                 hist_total = hist['time_ns'] + hist.get('generator_time_ns', 0)
                                 hist_ms = hist_total / 1_000_000
                                 hist_us = hist_total / 1_000
@@ -1366,6 +1465,16 @@ class HTMLGenerator:
                                 else:
                                     hist_git_link = hist_git
                                 history_items.append(f'<div class="history-item">{hist_date}: {hist_time_str} ({hist_git_link})</div>')
+                                
+                                # Store data for graph (reverse order for chronological display)
+                                hist_data_points.insert(0, {
+                                    'time_ns': hist_total,
+                                    'timestamp': hist.get('timestamp', ''),
+                                    'date': hist_date
+                                })
+                            
+                            # Generate SVG graph
+                            svg_graph = HTMLGenerator._generate_svg_graph(hist_data_points)
                             
                             history_modal = f'''
                                 <div id="history-{user}-{year}-{day}-{part}" class="modal">
@@ -1375,7 +1484,14 @@ class HTMLGenerator:
                                             <span class="modal-close" onclick="closeHistory('{user}', {year}, {day}, {part})">&times;</span>
                                         </div>
                                         <div>
-                                            {''.join(history_items)}
+                                            <div class="history-graph">
+                                                <strong>Performance Trend:</strong>
+                                                {svg_graph}
+                                            </div>
+                                            <div style="margin-top: 20px;">
+                                                <strong>History Details:</strong>
+                                                {''.join(history_items)}
+                                            </div>
                                         </div>
                                     </div>
                                 </div>