Intellisense is slow for numpy, pandas and similar

[dlefcoe]

I have imported pandas the standard way:

import pandas as pd

When I start coding, intellisense in vscode works fine until i import the pandas module and then it starts to go very slow.

There was a similar question here: https://github.com/microsoft/vscode-python/issues/5582
However, it was closed because as reply was given at the time.

[brettcannon]

What language server are you using? If you're not using Pylance can you give that a try?

[dlefcoe]

I believe that pylance was already running.

[dlefcoe]

observable behaviour:

y = pd.DataFrame(some_data) takes about 3 seconds for the intellisense to kick in.
The usual time for ntellisense is ~ 0.1 seconds.

also the calling of the variable some_data takes approximately 1 or 2 seconds.

if the coder was to type some_data in the next line below the intellisense becomes instant again.

y = pd.DataFrame(some_data) # the intellisense is slow here
some_data = 100 # the intellisense is instant here

[brettcannon]

If you have "python.languageServer": "Pylance" set then Pylance is your language server. If that's true then please file an issue at https://github.com/microsoft/pylance-release (unfortunately they don't have Discussions turned on so I can't transfer this over for you).