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Table of Contents
How to open the Performance panel
How to record a performance analysis
How to interpret performance reports
Common optimization suggestions
Home Computer Tutorials Browser How to use the performance detector in Edge

How to use the performance detector in Edge

Aug 02, 2025 am 12:15 AM
edge 性能檢測器

How to use Edge's performance analysis tools? Open the Developer Tools (F12 or Ctrl Shift I / Cmd Option I), switch to the Performance panel, click the Record button to perform the operation and stop generating a report. When interpreting, focus on the Summary, Flame chart, and Bottom-up areas to identify time-consuming tasks and functions. Optimization suggestions include reducing main thread load, avoiding re-painting, merging DOM operations, using throttling and anti-shake, lazy image loading, etc.

How to use the performance detector in Edge

Edge's Performance Detector is not an independent tool, but a series of functions integrated into the Edge Developer Tools (F12 Tools), mainly used to analyze performance issues during web page loading and running. It can help you find problems such as page stuttering, slow loading, and excessive resources. Although there is no button called "Performance Detector", we can use the Performance panel in DevTools to achieve similar functionality.

How to use the performance detector in Edge

Here are some practical suggestions to help you better use Edge's performance analysis tools.


How to open the Performance panel

To start analyzing page performance, first open the developer tools:

How to use the performance detector in Edge
  • Shortcut keys: F12 or Ctrl Shift I (Windows)/ Cmd Option I (Mac)
  • Then click Performance in the top tab

In this panel, you can record various performance data during the page loading or interaction process, such as loading time, function call stack, rendering frame rate, etc.


How to record a performance analysis

In the Performance panel, click the circular recording button (like a video logo) in the upper left corner, and then perform the actions you want to test, such as refreshing the page, clicking a button, or scrolling the page.

How to use the performance detector in Edge

After recording is completed, click the stop button again and you will see a detailed performance timeline.

Some key points to pay attention to:

  • You can check the "Screenshots" option before recording, which will generate screenshots to facilitate viewing the changes of each frame of the page.
  • It is more accurate to clear the cache and then test it to avoid the results of static resources being affected by the cache.
  • If you only want to see JS execution, you can turn off the "Network" panel to save interference.

How to interpret performance reports

After recording is complete, you will see several main areas:

  • Summary : Shows the task that takes the longest time on the main thread, and you can see which functions are executed for too long.
  • Flame chart: Shows the timeline of each task. The wider the time it takes, the longer it takes.
  • Bottom-up (bottom-up): Lists specific functions and their calling paths, suitable for finding specific bottlenecks.

If you find that a certain segment of JS takes up a lot of CPU time, you can click in to see which function caused the lag.

In addition, pay attention to whether there are Forced Synchronous Layouts or Long Tasks, which are key points in performance optimization.


Common optimization suggestions

Based on the results of performance analysis, you can take some common steps to improve performance:

  • Reduce main thread work and move complex calculations into Web Worker
  • Avoid frequent triggering of re-arrangement and re-painting, merge DOM operations
  • Use throttle and debounce to handle high-frequency events such as scrolling and resize
  • Lazy image loading, reducing initial loading pressure
  • Prioritize loading of critical CSS and JS, delaying non-critical resources

For example, doing too much in a scrolling event will cause frame drops. You can use requestAnimationFrame to optimize animation updates.


Basically all that is it. Although Edge's Performance panel looks complicated, as long as you master the basic processes and key indicators, you can quickly locate performance issues. Practice a few more times and you will find that it is actually quite intuitive.

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