Developers Tool Page

Overview

The Developers Tool Page provides developers with essential information about network activity, performance metrics, and system behavior during user sessions. It’s designed to help diagnose and troubleshoot performance and functionality issues efficiently.

Key Features

Network Information

View detailed network activity that occurred during the user session, including requests, responses, and load times. Analyze which resources (e.g., images, scripts, APIs) might have contributed to performance bottlenecks.

Performance Metrics

These metrics provide detailed insights into how your web page performs during user sessions. Leveraging these metrics can help you identify and address performance bottlenecks effectively:

• Page Load Timeline: A visual representation of the various stages of page loading, including DNS resolution, initial content rendering, and full load.
  • Key Benefit: Helps identify the stages that contribute most to overall load time.
  • Actionable Insight: Optimize server response times and leverage Content Delivery Networks (CDNs) to reduce delays.
  
• CPU Usage: A graph showing CPU usage during the session, highlighting resource-intensive moments.
  • Key Benefit: Pinpoints inefficient scripts or components that overload the CPU.
  • Actionable Insight: Consider optimizing JavaScript execution and deferring non-critical scripts.
  
• Average Network Speed: Indicates the average network speed experienced by the user, which helps in understanding loading delays.
  • Key Benefit: Understand how network conditions impact user experience, especially for users on slower connections.
  • Actionable Insight: Compress assets like images and optimize API requests to ensure faster load times on slower networks.
  
• Long Tasks: Identifies tasks that take a long time to execute, potentially causing lag or delays in the user experience.
  • Key Benefit: Highlights performance bottlenecks caused by heavy operations.
  • Actionable Insight: Break down complex scripts into smaller tasks and leverage web workers to offload heavy computations.
• Memory Usage: Provides information on memory consumption during the session, useful for diagnosing memory leaks or inefficient scripts.
  • Key Benefit: Detects memory inefficiencies that could lead to browser crashes or slowdowns.
  • Actionable Insight: Use browser developer tools to monitor heap memory usage and identify unused variables or listeners.
  
• Cumulative Layout Shift (CLS): Measures the visual stability of the page by tracking layout shifts during the session. A high CLS score indicates poor user experience.
  • Key Benefit: Improves user satisfaction by minimizing unexpected layout shifts.
  • Actionable Insight: Define size attributes for images and videos to avoid layout jumps and preload fonts for faster rendering.
• Crashes: Lists any crashes or critical errors that occurred during the session, providing insights for debugging.
  • Key Benefit: Identifies critical issues that disrupt user sessions, enabling faster fixes.
  • Actionable Insight: Use crash logs to diagnose errors and implement retry mechanisms for critical functionalities.

Session Sharing

Generate a shareable URL to easily share session data and performance insights with team members or stakeholders. This feature is useful for collaborative debugging or performance review.

Navigation to DOM View

Quickly navigate to the DOM View Page from the Developers Tool Page for a more detailed inspection of the DOM elements and structure. This integration ensures seamless access between performance analysis and DOM inspection.

How to Use the Developers Tool Page

Review Network Information

Examine network requests to identify slow or failed resource loads. Use this data to optimize network performance, such as reducing payload size or optimizing API calls.

Analyze Performance Metrics

Check the following key metrics:

• Page Load Timeline: Optimize the speed of your page load by checking the breakdown of loading stages.
• CPU and Memory Usage: Identify spikes in resource usage that could indicate inefficiencies or bottlenecks in the application.
• Long Tasks: Investigate tasks that block the main thread for too long, affecting responsiveness.
• Cumulative Layout Shift: Use CLS data to improve layout stability and reduce unexpected shifts that annoy users.
• Crashes: Prioritize fixing issues that cause crashes to improve the reliability of your application.

Sharing and Collaboration

Click on the Share button to generate a URL. Share this link with your team for collaborative troubleshooting or performance optimization discussions.

Navigate to DOM View Page

Use the provided link to jump directly to the DOM View Page, where you can inspect elements and understand how the DOM structure impacts performance.

Best Practices

Focus on Long Tasks and CPU Usage

These metrics are critical for ensuring a smooth user experience. Optimize scripts and limit heavy computations to avoid performance issues.

Analyze Network Speed and Page Load Timeline

Identify resources that slow down loading and look for opportunities to cache or load resources more efficiently.

Monitor Crashes and Memory Usage

Regularly review crash reports and memory data to maintain a stable and efficient application.