Mastering Code Navigation and Performance in VS Code: Python Extension March 2026 Update

Overview

The March 2026 release of the Python extension for Visual Studio Code introduces two powerful features designed to accelerate your development workflow: Search Python Symbols in Installed Packages and an Experimental Rust-Based Parallel Indexer. This guide provides a step-by-step walkthrough to enable and use these features effectively, along with practical tips to avoid common pitfalls.

Mastering Code Navigation and Performance in VS Code: Python Extension March 2026 Update — Source: devblogs.microsoft.com

Whether you are exploring a new codebase, debugging a third-party library, or working on a large project, these enhancements help you navigate code faster and keep IntelliSense responsive. Let’s dive in.

Prerequisites

Before following this guide, ensure you have:

Visual Studio Code installed (version 1.93 or later recommended).
The Python extension for VS Code (version March 2026 or later).
The Pylance language server (included with the Python extension).
A Python project with an active virtual environment that contains installed packages.
Basic familiarity with VS Code settings (Settings UI and settings.json).

Step-by-Step Instructions

1. Enable Symbol Search in Installed Packages

This feature lets you use Workspace Symbol Search (Cmd+T on macOS, Ctrl+T on Windows/Linux) to find functions, classes, and variables defined inside packages installed in your virtual environment's site-packages directory.

Step 1.1: Open VS Code Settings

Press Cmd+, (macOS) or Ctrl+, (Windows/Linux) to open the Settings editor.

Step 1.2: Locate the Setting

In the search bar at the top, type Include Venv In Workspace Symbols.

Step 1.3: Enable the Feature

Under the Python > Analysis section, check the box labeled Python › Analysis: Include Venv In Workspace Symbols. Alternatively, you can add the following to your settings.json:

"python.analysis.includeVenveInWorkspaceSymbols": true

Step 1.4: (Optional) Control Index Depth per Package

To fine-tune how deeply Pylance indexes each package, use the setting Python › Analysis: Package Index Depths. This is an array of objects where you specify package names and depth levels. For example, to index only the top-level symbols of numpy but dive deeper into pandas:

"python.analysis.packageIndexDepths": [
  {"name": "numpy", "depth": 1},
  {"name": "pandas", "depth": 3}
]

Now, when you press Ctrl+T and type a symbol name, results will include definitions from your installed packages. Note that for libraries lacking py.typed markers, only symbols exported via __init__.py or __all__ are shown – keeping the list focused and relevant.

2. Activate the Experimental Rust-Based Parallel Indexer

This feature replaces Pylance’s default indexer with a parallel, out-of-process implementation written in Rust. It is designed to speed up completions, auto-imports, and workspace symbol search – especially in large projects.

Step 2.1: Open Settings

Same as before: press Cmd+, or Ctrl+,.

Step 2.2: Search for Parallel Indexing

Type Parallel Indexing into the Settings search bar.

Step 2.3: Enable the Experimental Setting

Check the box labeled Enable Parallel Indexing (Experimental) under Python › Analysis. You can also add this line to settings.json:

"python.analysis.enableParallelIndexing": true

Step 2.4: Reload VS Code

For the new indexer to start cleanly, reload the window: press Cmd+Shift+P (macOS) or Ctrl+Shift+P (Windows/Linux) to open the Command Palette, type Reload Window, and press Enter.

After reload, you should notice faster completion responses and a more responsive IntelliSense on large projects. In internal tests, this indexer is on average 10× faster on large Python codebases.

Common Mistakes

Forgetting to enable the feature: Both features are opt-in. If you don’t enable them, you won’t see any change. Double-check your settings.
Not reloading after enabling the parallel indexer: The new indexer only activates after a full VS Code window reload. Skipping this step means the old indexer continues running.
Expecting dramatic speedups on small projects: The parallel indexer shines on projects with many files and packages. On small projects, you may see little to no improvement.
Misunderstanding symbol search scope: With Include Venv In Workspace Symbols enabled, symbols from packages appear only if they are exported. If a function is not in __init__.py or __all__, it won’t show up – this is intentional to reduce noise.
Ignoring performance impact: Indexing installed packages can slow down initial indexing. Use packageIndexDepths to limit depth on large packages like tensorflow.

Summary

The March 2026 Python extension update brings two major enhancements: the ability to search for symbols inside installed packages (making code exploration seamless) and an experimental Rust‑based parallel indexer (boosting IntelliSense performance on large projects). By following the steps above, you can enable both features, customize their behavior, and avoid common pitfalls. Try them out and enjoy a more efficient coding experience in VS Code.