Pylance draining battery by constantly triggering indexing?

[eliasla]

Type: Bug

Just by opening my project, pylance uses a lot of battery / cpu (Activity monitor says over 1000 for energy impact for a couple of seconds) by indexing like every 15 seconds or so. I'm looking at python language server log and it keeps saying this over and over again.

file:///Users/user/.vscode/extensions/ms-python.vscode-pylance-2025.3.1/dist (refresh)
2025-03-09 17:19:47.404 [info] [Info  - 5:19:47 PM] (99085) Indexing(43) started
2025-03-09 17:19:47.587 [info] [Info  - 5:19:47 PM] (99085) scanned(43) 169 files over 1 exec env
2025-03-09 17:19:47.656 [info] [Info  - 5:19:47 PM] (99085) indexed(43) 169 files over 1 exec env
2025-03-09 17:19:47.667 [info] [Info  - 5:19:47 PM] (99085) Indexing finished(43).

Extension version: 2025.3.1
VS Code version: Code 1.98.0 (6609ac3d66f4eade5cf376d1cb76f13985724bcb, 2025-03-04T21:06:18.612Z)
OS version: Darwin arm64 24.3.0
Modes:

System Info

Item	Value
CPUs	Apple M4 Pro (12 x 2400)
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: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	2, 2, 2
Memory (System)	24.00GB (0.83GB free)
Process Argv	--crash-reporter-id cbd2752b-6d18-4dd8-8fe8-a20501ebfa4d
Screen Reader	no
VM	0%

A/B Experiments

vsliv368cf:30146710
vspor879:30202332
vspor708:30202333
vspor363:30204092
vscod805:30301674
binariesv615:30325510
py29gd2263:31024239
c4g48928:30535728
azure-dev_surveyone:30548225
962ge761:30959799
h48ei257:31000450
pythontbext0:30879054
cppperfnew:31000557
dwnewjupyter:31046869
nativerepl2:31139839
pythonrstrctxt:31112756
nativeloc2:31192216
iacca1:31171482
5fd0e150:31155592
dwcopilot:31170013
6074i472:31201624
dwoutputs:31242946
customenabled:31248079
8did9651:31230678
9064b325:31222308
copilot_t_ci:31222730
f5992895:31254866
jda6j935:31233686
5b33h341:31253271

[bschnurr]

can you send a longer log to see whats triggering indexing

[eliasla]

Sure. This is what happens when i open vscode.

2025-03-09 21:29:48.517 [info] (Client) Pylance async client (2025.3.1) started with python extension (2025.2.0)
2025-03-09 21:29:48.848 [info] [Info  - 9:29:48 PM] (7076) Server root directory: file:///Users/user/.vscode/extensions/ms-python.vscode-pylance-2025.3.1/dist
2025-03-09 21:29:48.848 [info] [Info  - 9:29:48 PM] (7076) Pylance language server 2025.3.1 (pyright version 1.1.396, commit 3e2236a7) starting
2025-03-09 21:29:48.852 [info] [Info  - 9:29:48 PM] (7076) Starting service instance "my_service"
2025-03-09 21:29:48.911 [info] [Info  - 9:29:48 PM] (7076) Setting environmentName for service "my_service": "3.9.11 (my_service venv)"
2025-03-09 21:29:48.933 [info] [Info  - 9:29:48 PM] (7076) Setting pythonPath for service "my_service": "/Users/user/.virtualenvs/my_service/bin/python"
2025-03-09 21:29:48.948 [info] [Info  - 9:29:48 PM] (7076) No include entries specified; assuming /Users/user/dev/my_service/my_service
2025-03-09 21:29:48.980 [info] [Info  - 9:29:48 PM] (7076) Auto-excluding **/node_modules
2025-03-09 21:29:48.983 [info] [Info  - 9:29:48 PM] (7076) Auto-excluding **/__pycache__
2025-03-09 21:29:49.002 [info] [Info  - 9:29:49 PM] (7076) Auto-excluding **/.*
2025-03-09 21:29:49.015 [info] [Info  - 9:29:49 PM] (7076) Assuming Python version 3.9.11.final.0
2025-03-09 21:29:49.310 [info] [Info  - 9:29:49 PM] (7076) Found 856 source files
2025-03-09 21:29:49.342 [info] [Info  - 9:29:49 PM] (7076) Background analysis(1) root directory: file:///Users/user/.vscode/extensions/ms-python.vscode-pylance-2025.3.1/dist
2025-03-09 21:29:49.343 [info] [Info  - 9:29:49 PM] (7076) Background analysis(1) started
2025-03-09 21:29:49.647 [info] [Info  - 9:29:49 PM] (7076) Indexer background runner(2) root directory: file:///Users/user/.vscode/extensions/ms-python.vscode-pylance-2025.3.1/dist (index)
2025-03-09 21:29:49.670 [info] [Info  - 9:29:49 PM] (7076) Indexing(2) started
2025-03-09 21:29:49.975 [info] [Info  - 9:29:49 PM] (7076) scanned(2) 169 files over 1 exec env
2025-03-09 21:29:50.063 [info] [Info  - 9:29:50 PM] (7076) indexed(2) 169 files over 1 exec env
2025-03-09 21:29:50.089 [info] [Info  - 9:29:50 PM] (7076) Indexing finished(2).
2025-03-09 21:30:09.170 [info] [Info  - 9:30:09 PM] (7076) Indexer background runner(3) root directory: 
file:///Users/user/.vscode/extensions/ms-python.vscode-pylance-2025.3.1/dist (refresh)
2025-03-09 21:30:09.170 [info] [Info  - 9:30:09 PM] (7076) Indexing(3) started
2025-03-09 21:30:09.368 [info] [Info  - 9:30:09 PM] (7076) scanned(3) 169 files over 1 exec env
2025-03-09 21:30:09.448 [info] [Info  - 9:30:09 PM] (7076) indexed(3) 169 files over 1 exec env
2025-03-09 21:30:09.471 [info] [Info  - 9:30:09 PM] (7076) Indexing finished(3).
2025-03-09 21:30:24.108 [info] [Info  - 9:30:24 PM] (7076) Indexer background runner(4) root directory: file:///Users/user/.vscode/extensions/ms-python.vscode-pylance-2025.3.1/dist (refresh)
2025-03-09 21:30:24.108 [info] [Info  - 9:30:24 PM] (7076) Indexing(4) started
2025-03-09 21:30:24.288 [info] [Info  - 9:30:24 PM] (7076) scanned(4) 169 files over 1 exec env
2025-03-09 21:30:24.355 [info] [Info  - 9:30:24 PM] (7076) indexed(4) 169 files over 1 exec env
2025-03-09 21:30:24.367 [info] [Info  - 9:30:24 PM] (7076) Indexing finished(4).
2025-03-09 21:30:39.140 [info] [Info  - 9:30:39 PM] (7076) Indexer background runner(5) root directory: file:///Users/user/.vscode/extensions/ms-python.vscode-pylance-2025.3.1/dist (refresh)
2025-03-09 21:30:39.140 [info] [Info  - 9:30:39 PM] (7076) Indexing(5) started
2025-03-09 21:30:39.313 [info] [Info  - 9:30:39 PM] (7076) scanned(5) 169 files over 1 exec env
2025-03-09 21:30:39.379 [info] [Info  - 9:30:39 PM] (7076) indexed(5) 169 files over 1 exec env
2025-03-09 21:30:39.389 [info] [Info  - 9:30:39 PM] (7076) Indexing finished(5).
2025-03-09 21:30:54.006 [info] [Info  - 9:30:54 PM] (7076) Indexer background runner(6) root directory: file:///Users/user/.vscode/extensions/ms-python.vscode-pylance-2025.3.1/dist (refresh)