Visual Studio Code Intellisense is very slow - Is there anything I can do?

Question

Edit: Pylance seems to be much better at this and has so far resolved all problems with the previous Python language server from Microsoft.

I\'m using VS Code an

Answer 1

It turned out it was a particular VS Code extension for me.
Angular Language Service. Disabling this made it lightning quick.

Try this to see if it is a particular extension.

• Open Command Palette (Ctrl+Shift+P)
• Type in "Disable all installed extensions"
• Enable them one by one or in groups and test the intellisense speed

Answer 2

My answer's for c++ but still kinda related.

I'm using the C/C++ extension from Microsoft, and when I switched its Intelli Sense Engine setting from Default, with "context-aware results", to Tag Parser, with "'fuzzy' results that are not context-aware", it immediately started showing IntelliSense options instead of delaying for 5+ seconds.

So maybe check the particular options of your language's or environment's extension(s).

Answer 3

Maybe it's Jedi. I mean its awesome but ... Tinkering with Jedi myself on bigger code bases I can confirm that it might be uber slow at times and pretty hard to figure out what the problems are... :/

Solution might be to switch to another language server! The VSCode Python extension has a "Language Server"-setting:

aka python.languageServer.

Pylance is MS own new language server. I just tried it and it all seems a little snappier. As of today this is tagged as Preview. So there might be improvements around the corner.

Answer 4

I had the same problem with Python on VS Code. In my case, disabling Jedi for IntelliSence made things faster.

Just set "python.jediEnabled": false in the options.

As memory is not a problem for me, I also enabled code analysis to keep parser trees in memory: "python.analysis.memory.keepLibraryAst": true

Answer 5

The problem might be with wrong setting configuration.
You might want to make sure these setting are on:

Controls if suggestions should automatically show up while typing

"editor.quickSuggestions": {
  "other": true,
  "comments": false,
  "strings": false
},

Controls the delay in ms after which quick suggestions will show up

"editor.quickSuggestionsDelay": 10,

Answer 6

Open Command Palette (Ctrl+Shift+P)

Select Developer: show running extension

You will get their list of extensions and their reboot time

If extension takes more than 500ms to activate there seems to be a problem with it

You can press on right click and stop it

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