Symbol navigation is slow in large project with python venv

Environment data

• VS Code version: 1.23.1
• Extension version (available under the Extensions sidebar): 2018.4.0
• OS and version: MacOS 10.13.4
• Python version (& distribution if applicable, e.g. Anaconda): Python3.6
• Type of virtual environment used (N/A | venv | virtualenv | conda | …): venv
• Relevant/affected Python packages and their versions: tensorflow

Actual behavior

Symbol navigation is slow,about 5 seconds after open symbol navigation every time large gif here:5.7M ,here is a compress gif,it’s speed up

Expected behavior

faster as it in small project

Steps to reproduce:

1. install some package such as tensorflow in venv
2. use Symbol navigation

Logs

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

[2018-05-23 15:18:15.484] [exthost2] [info] ExtensionService#_doActivateExtension vscode.python {"startup":false,"activationEvent":"onLanguage:python"}
[2018-05-23 15:18:15.484] [exthost2] [info] ExtensionService#loadCommonJSModule /Applications/Visual Studio Code.app/Contents/Resources/app/extensions/python/out/pythonMain
[2018-05-23 15:18:15.486] [exthost2] [info] ExtensionService#_doActivateExtension ms-python.python {"startup":false,"activationEvent":"onLanguage:python"}
[2018-05-23 15:18:15.486] [exthost2] [info] ExtensionService#loadCommonJSModule /Users/zhutou/.vscode/extensions/ms-python.python-2018.4.0/out/client/extension

How can I profile this behavior?I have enable vscode profile but there is nothing about this extensions

[zjjott]

@brettcannon but actually,everytime the same file open the navigation,it’s slow I don’t know,why a file with less than 100 lines cost so long time. as I know ,Symbol navigation should only load once?

[brettcannon]

Closing as this is an upstream issue which we don’t have direct control or influence over.