(regression) Typing causes high CPU usage #25357
Description
Type: Bug
Behaviour
Typing anything in python will result in high resource usage not seen in previous versions of this software.
If you are decently fast at typing code, you'll hear your poor CPU complain about the stress seemingly innocuous text places upon it.
This has been tested with all other extensions disabled except for:
- Pylance
- Python
- Python debugger
- Python environments
Steps to reproduce:
- With the latest release (1.102.3)
- Use a relatively large python file (1000+ lines). A test file is a good case for this.
- Anywhere in the file, spam text. Look at your system's CPU usage.
- Watch those lines go up, and not in a good way!
Screencast.From.2025-08-06.11-22-37.mp4
Diagnostic data
Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)
XXX
Extension version: 2025.10.1
VS Code version: Code 1.102.3 (488a1f239235055e34e673291fb8d8c810886f81, 2025-07-29T03:00:23.339Z)
OS version: Linux x64 6.15.8-200.fc42.x86_64
Modes:
- Python version (& distribution if applicable, e.g. Anaconda): 3.12.11
- Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Conda
- Value of the
python.languageServersetting: Default
User Settings
languageServer: "Pylance"
testing
• pytestArgs: "<placeholder>"
• pytestEnabled: true
experiments
• enabled: false
Installed Extensions
| Extension Name | Extension Id | Version |
|---|---|---|
| debugpy | ms- | 2025.10.0 |
| js-debug | ms- | 1.102.0 |
| js-debug-companion | ms- | 1.1.3 |
| python | ms- | 2025.10.1 |
| vscode-js-profile-table | ms- | 1.0.10 |
| vscode-pylance | ms- | 2025.7.1 |
| vscode-python-envs | ms- | 1.2.0 |
System Info
| Item | Value |
|---|---|
| CPUs | 13th Gen Intel(R) Core(TM) i7-13700H (20 x 3700) |
| GPU Status | 2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: disabled_off webnn: disabled_off |
| Load (avg) | 2, 1, 1 |
| Memory (System) | 15.25GB (7.10GB free) |
| Process Argv | |
| Screen Reader | no |
| VM | 0% |
| DESKTOP_SESSION | gnome |
| XDG_CURRENT_DESKTOP | GNOME |
| XDG_SESSION_DESKTOP | gnome |
| XDG_SESSION_TYPE | wayland |