High CPU Utilization

[dbaileyut]

Type: Performance Issue

Hi, after running VS Code for a while and having multiple windows opened, the extension host process with Code Spell Checker starts consuming 20% of my CPU per VS Code window.

Extension version: 4.2.6 VS Code version: Code 1.105.1 (7d842fb85a0275a4a8e4d7e040d2625abbf7f084, 2025-10-14T22:33:36.618Z) OS version: Windows_NT x64 10.0.26100 Modes:

System Info

Item	Value
CPUs	Intel(R) Xeon(R) Gold 6240 CPU @ 2.60GHz (4 x 2594)
GPU Status	2d_canvas: unavailable_software direct_rendering_display_compositor: disabled_off_ok gpu_compositing: disabled_software multiple_raster_threads: enabled_on opengl: disabled_off rasterization: disabled_software raw_draw: disabled_off_ok skia_graphite: disabled_off trees_in_viz: disabled_off video_decode: disabled_software video_encode: disabled_software vulkan: disabled_off webgl: unavailable_software webgl2: unavailable_software webgpu: unavailable_software webnn: unavailable_software
Load (avg)	undefined
Memory (System)	16.00GB (2.19GB free)
Process Argv	--crash-reporter-id 50de7da2-a8d2-445d-bbd9-64c3222c98f1
Screen Reader	no
VM	50%

Process Info

CPU %	Mem MB	   PID	Process
    0	    74	 28676	code
    0	    14	  2292	   utility-network-service
   18	   154	  2468	extension-host [1]
    0	     2	  6908	     "C:\Program Files\Microsoft VS Code\Code.exe" c:\Users\userName\.vscode\extensions\streetsidesoftware.code-spell-checker-4.2.6\packages\_server\dist\main.cjs --node-ipc --clientProcessId=2468
    0	     2	 10212	     electron-nodejs (languageserver.js )
    0	     6	 10988	     electron-nodejs (tsserver.js )
    0	    12	  8812	       electron-nodejs (typingsInstaller.js typesMap.js )
    0	     2	 16056	     "C:\Program Files\Microsoft VS Code\Code.exe" "c:\Program Files\Microsoft VS Code\resources\app\extensions\json-language-features\server\dist\node\jsonServerMain" --node-ipc --clientProcessId=2468
    0	     7	 21040	     electron-nodejs (tsserver.js )
   20	   389	  5208	window [1] (● - userName - $RegionList = @( • Untitled-1 - userNameWorking (Workspace) - Visual Studio Code)
    0	     2	  6304	   crashpad-handler
   18	   152	 21404	extension-host [2]
    0	     3	 12712	     "C:\Program Files\Microsoft VS Code\Code.exe" c:\Users\userName\.vscode\extensions\streetsidesoftware.code-spell-checker-4.2.6\packages\_server\dist\main.cjs --node-ipc --clientProcessId=21404
    0	    25	 21472	pty-host
    0	     8	  6096	     "C:\Program Files\PowerShell\7\pwsh.exe" -noexit -command "try { . \"c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\contrib\terminal\common\scripts\shellIntegration.ps1\" } catch {}"
    0	     1	 17992	     conpty-agent
    0	     1	 18836	     conpty-agent
    0	     2	 22072	     conpty-agent
    0	  1002	 24900	     "C:\Program Files\PowerShell\7\pwsh.exe" -NoProfile -ExecutionPolicy Bypass -Command "Import-Module 'c:\Users\userName\.vscode\extensions\ms-vscode.powershell-2025.4.0\modules\PowerShellEditorServices\PowerShellEditorServices.psd1'; Start-EditorServices -HostName 'Visual Studio Code Host' -HostProfileId 'Microsoft.VSCode' -HostVersion '2025.4.0' -BundledModulesPath 'c:\Users\userName\.vscode\extensions\ms-vscode.powershell-2025.4.0\modules' -EnableConsoleRepl -StartupBanner \"PowerShell Extension v2025.4.0
Copyright (c) Microsoft Corporation.

https://aka.ms/vscode-powershell
Type 'help' to get help.
\" -LogLevel 'Warning' -LogPath 'c:\Users\userName\AppData\Roaming\Code\logs\20251030T115946\window1\exthost\ms-vscode.powershell' -SessionDetailsPath 'c:\Users\userName\AppData\Roaming\Code\User\globalStorage\ms-vscode.powershell\sessions\PSES-VSCode-28676-769903.json' -FeatureFlags @() "
    0	    14	 26072	     "C:\Program Files\PowerShell\7\pwsh.exe" -NoProfile -ExecutionPolicy Bypass -Command "Import-Module 'c:\Users\userName\.vscode\extensions\ms-vscode.powershell-2025.4.0\modules\PowerShellEditorServices\PowerShellEditorServices.psd1'; Start-EditorServices -HostName 'Visual Studio Code Host' -HostProfileId 'Microsoft.VSCode' -HostVersion '2025.4.0' -BundledModulesPath 'c:\Users\userName\.vscode\extensions\ms-vscode.powershell-2025.4.0\modules' -EnableConsoleRepl -StartupBanner \"PowerShell Extension v2025.4.0
Copyright (c) Microsoft Corporation.

https://aka.ms/vscode-powershell
Type 'help' to get help.
\" -LogLevel 'Warning' -LogPath 'c:\Users\userName\AppData\Roaming\Code\logs\20251030T115946\window2\exthost\ms-vscode.powershell' -SessionDetailsPath 'c:\Users\userName\AppData\Roaming\Code\User\globalStorage\ms-vscode.powershell\sessions\PSES-VSCode-28676-959708.json' -FeatureFlags @() "
    0	    14	 22188	file-watcher [1]
    0	    88	 23004	   gpu-process
    0	    15	 23880	file-watcher [2]
    1	   109	 24572	shared-process
    0	   197	 29124	window [2] (● - userName - Visual Studio Code)

Workspace Info

|  Window (● - userName - Visual Studio Code)
|    Folder (myFolder): 49 files
|      File types: ps1(16) json(3) psd1(3) csv(3) md(3) txt(3) png(2)
|                  gitignore(1) MD(1) html(1)
|      Conf files: launch.json(1) settings.json(1)
|      Launch Configs: PowerShell;

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