Issue Type | Typical Manifestation | Possible Causes | Key Metrics |
---|---|---|---|
Slow page loading | Long white screen time, slow first render | - Oversized resources - Render-blocking scripts or CSS - Slow server response | LCP, FCP, TTI |
Interaction delays | No response to clicks, operation lag | - Long JavaScript execution time - Too many event listeners - Frequent DOM operations | FID, INP, TBT |
Resource loading abnormalities | Image/script loading failure, timeout | - CDN configuration errors - Unstable network - Incorrect resource paths | Resource loading time, Failure rate, DNS resolution time |
JavaScript errors | Functionality failure, console errors | - Code logic errors - Browser compatibility issues - Memory leaks | Error rate, Memory usage, CPU usage |
Network connection issues | Request timeout, connection interruption | - Slow API response - Poor network quality - Cross-domain configuration errors | Request latency, Connection success rate, Bandwidth usage |