ipykernel 7.0.1 - Jupyter autocomplete delay #1452

Issue:
When using VS Code with the Jupyter extension, triggering autocomplete (Ctrl + Space) inside a notebook cell causes a noticeable delay (~2–3 seconds). This only happens in Jupyter notebooks, regular .py files are unaffected.

Steps to reproduce:

1. Open a Jupyter notebook in VS Code.
2. Import any Python module (e.g., import pandas as pd).
3. Inside a new cell, type something like pd. and press Ctrl + Space.
4. Observe a 2–3 second delay before suggestions appear.

Expected behavior:
Autocomplete should appear instantly, as it does in .py files.

Reverting ipykernel to version 6.30.1 immediately fixes the issue.