How to debug memory issues with Edge DevTools
Jul 31, 2025 am 01:58 AM
When encountering memory problems, Edge's DevTools provides a Memory panel for taking memory snapshots and comparing differences, and can locate unreleased DOM nodes or closure functions; 1. Use the Performance panel to monitor memory changes and view indicators such as JS heap memory and the number of DOM nodes; 2. Use Heap Snapshot to analyze the retained size and reference chains, and focus on checking the retained size large objects and (closure) or (array) types; 3. Pay attention to multiple snapshot comparisons, checking third-party libraries, using weak reference structures, and using task managers to confirm memory status.
When encountering memory problems, Edge's DevTools is actually a very handy tool. It provides many functions to help you locate and solve memory leaks, over-occupying and other problems. The key is to know which panels to use and how to analyze data.
Find the memory-occupancy large header: Memory panel
The Memory panel in Edge DevTools is the core of troubleshooting memory issues. You can take a snapshot here to see which objects in the current page take up the most memory.
How to use is very simple:
- Open DevTools (F12 or right-click to check)
- Switch to the Memory tag
- Click Take snapshot and do some operations (such as opening and closing a module, clicking a button, etc.)
- Take another snapshot to compare the differences between the two snapshots
Focus on objects that are not released, especially DOM nodes or closure functions, which may be the source of memory leaks.
A small trick: If you see a lot of
Detached DOM tree, it means that although some nodes have been removed from the page, they are still being referenced by certain variables. Remember to check whether the event listening or cache mechanism has been cleaned up.
Monitor memory changes in real time: Performance panel
If you want to observe the memory trend of the page during runtime, you can use the Performance panel.
Operation steps:
- Open the Performance panel
- Check the Memory option (usually, check it by default)
- Click Record and then do some interactions
- After stopping recording, you will see the line graph of memory usage
This chart can help you find out whether there is any continued memory rise. If the memory goes up and does not fall after each action is performed, there is a very likely leak.
In addition, you can see indicators such as JS heap memory, document objects, number of DOM nodes in the "Summary" below, which are all key information for diagnosis.
View object retention tree: Heap Snapshot Analysis
Heap Snapshot is the most commonly used tool to troubleshoot memory leaks. You can see the retained size of each object through it, which is how much memory it can be released if the object is garbage collected.
Several key points:
- View the Summary view, classify it by constructor, and find objects with retained size large
- Right-click an object and select "Retaining tree" to see who is referring to it
- If you see a lot of
(closure)or(array)that takes up a large chunk of memory, it may be because the function closure or array is not released.
For example: if you bind an event listener to window, but the component is not unbind when uninstalling, then the listener may be hung all the time, resulting in the relevant variables being unable to be released.
Tips and precautions
- Don’t just look at the snapshot once, take a few more times, so that the comparison changes will be meaningful.
- Note that third-party libraries may also introduce memory problems, especially those that use a large number of DOM operations or global state management.
- Using weak reference structures (such as WeakMap, WeakSet) can avoid some common memory problems.
- If you are not sure if it is a memory issue, you can first check out the JavaScript memory usage in the Task Manager (Shift Esc).
Basically that's it. Memory debugging looks complicated, but as long as you master the usage of several core panels and combine them with actual code logic to check the reference chain, most problems can be solved.
The above is the detailed content of How to debug memory issues with Edge DevTools. For more information, please follow other related articles on the PHP Chinese website!
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