diff --git a/src/index.js b/src/index.js
index 6324f2db..eff6b9e9 100755
--- a/src/index.js
+++ b/src/index.js
@@ -5,6 +5,17 @@ import { BrowserRouter as Router } from 'react-router-dom';
 
 // ⚡ 性能监控：在应用启动时尽早标记
 import { performanceMonitor } from './utils/performanceMonitor';
+
+// T0: HTML 加载完成时间点
+if (document.readyState === 'complete') {
+  performanceMonitor.mark('html-loaded');
+} else {
+  window.addEventListener('load', () => {
+    performanceMonitor.mark('html-loaded');
+  });
+}
+
+// T1: React 开始初始化
 performanceMonitor.mark('app-start');
 
 // ⚡ 已删除 brainwave.css（项目未安装 Tailwind CSS，该文件无效）
diff --git a/src/utils/performanceMonitor.ts b/src/utils/performanceMonitor.ts
index 2c4b115f..961e0cc4 100644
--- a/src/utils/performanceMonitor.ts
+++ b/src/utils/performanceMonitor.ts
@@ -2,6 +2,7 @@
 // 性能监控工具 - 统计白屏时间和性能指标
 
 import { logger } from './logger';
+import { reportPerformanceMetrics } from '../lib/posthog';
 
 /**
  * 性能指标接口
@@ -208,6 +209,9 @@ class PerformanceMonitor {
     // 性能分析建议
     this.analyzePerformance();
 
+    // 上报性能指标到 PostHog
+    reportPerformanceMetrics(this.metrics);
+
     return this.metrics;
   }