The main reasons for the slowdown of VSCode debugger include improper selection of debug protocols, excessive breakpoints, plug-in interference, and unreasonable project structure. The optimization methods are as follows: 1. Priority is given to the use of efficient debugging protocols such as built-in JS debugger or LLDB; 2. Reduce the number of breakpoints and avoid complex conditional breakpoints; 3. Disable irrelevant plug-ins and animation effects; 4. Optimize the project structure to exclude useless file indexes. Debugging performance can be significantly improved through targeted adjustments.
If you feel very slow when using VSCode's debugger, don't worry, this situation is actually quite common. The main reason is usually not the problem with VSCode itself, but the environment configuration, plug-in conflicts or inefficient debugging protocols. Below are some common reasons and optimization suggestions to help you speed up the debugging process.

Check debugger type and protocol
VSCode supports a variety of debugging protocols, such as gdb
, lldb
, Chrome DevTools
, etc. The performance of different protocols varies greatly, especially between local debugging and remote debugging.

- Try to use the built-in debugger : For example, JavaScript/TypeScript can directly use the built-in JS debugger (vsce), which is much faster than the old version.
- Avoid unnecessary remote debugging : Remote debugging requires the transmission of a large amount of data, which can easily cause delays.
- Switch to a more efficient debugging backend : For example, in C, LLDB is sometimes faster than GDB, so you can try switching.
Reduce the number of breakpoints and conditional breakpoint usage
Too many breakpoints, especially conditional breakpoints, can significantly slow down the debugger response.
- Try to keep only necessary breakpoints
- Avoid setting breakpoints in loops or high-frequency calls
- Try to judge conditional breakpoints with simple expressions
For example: If you add a conditional breakpoint to an event listening that is triggered dozens of times per second, you have to determine whether the condition is satisfied each time, which will significantly slow down execution.

Disable unnecessary extensions and autoloading capabilities
Some plugins inject extra logic during debugging, affecting performance.
- Disable irrelevant plugins when debugging (especially those that provide an "enhanced debugging experience")
- Turn off animation effects such as "automatically jump to breakpoint source code"
- If you do not need to view the variable value, you can turn off the variable automatic refresh
You can test whether it is a plug-in-caused speed problem by starting code --disable-extensions
.
Optimize project structure and file index
Debuggers sometimes get slower because they load too much file or symbolic information.
- Add unrelated large folders to
"files.watcherExclude"
and"search.exclude"
in.vscode/settings.json
- Enable
"smartSense"
for large projects or limit the scope of smart prompts - Use
.ds_store
or.gitignore
rules to help VSCode ignore useless directories
This reduces the burden on the initialization phase of the debugger.
Basically that's it. The slow debugger is often not a big problem, but it can indeed improve the experience through some detailed adjustments. The key is to deal with it in a targeted manner based on the specific language and scenario.
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