Slow code completion outside of methods

[SuperDino484]

Environment

• OS and Version: Windows 11 24H2
• VS Code Version: 1.98.2
• C/C++ Extension Version: 1.23.6
• If using SSH remote, specify OS of remote machine:

Bug Summary and Steps to Reproduce

Bug Summary: Having a vulkan project (through cmake) intellisense is very slow outside of any methods in source and header files.

Steps to reproduce:

1. Add vulkan to cmake with find_package(Vulkan REQUIRED) and target_link_libraries(ProjectName PRIVATE Vulkan::Vulkan)
2. In main.cpp add #include <vulkan/vulkan.h>
3. Start typing vulkan specific items such as VkDevice VkApplicationInfo, etc.
4. The intellisense takes a very long time to update.

Configuration and Logs

-------- Diagnostics - 3/29/2025, 5:13:54 PM
Version: 1.23.6
Current Configuration:
{
    "name": "Win32",
    "includePath": [
        "c:/Users/<user>/Programming/DungeonGame/**"
    ],
    "defines": [
        "_DEBUG",
        "UNICODE",
        "_UNICODE"
    ],
    "windowsSdkVersion": "10.0.22621.0",
    "compilerPath": "cl.exe",
    "cStandard": "c17",
    "cppStandard": "c++17",
    "intelliSenseMode": "windows-msvc-x64",
    "compilerPathInCppPropertiesJson": "cl.exe",
    "intelliSenseModeIsExplicit": false,
    "cStandardIsExplicit": false,
    "cppStandardIsExplicit": false,
    "mergeConfigurations": false,
    "compilerPathIsExplicit": false,
    "configurationProvider": "ms-vscode.cmake-tools",
    "browse": {
        "path": [
            "c:/Users/<user>/Programming/DungeonGame/**",
            "${workspaceFolder}"
        ],
        "limitSymbolsToIncludedHeaders": true
    }
}
Modified Settings:
{
    "C_Cpp.intelliSenseMemoryLimit": 8192
}
Additional Tracked Settings:
{
    "editorTabSize": 4,
    "editorInsertSpaces": true,
    "editorAutoClosingBrackets": "languageDefined",
    "filesEncoding": "utf8",
    "filesAssociations": {
        "*.rkt": "clojure"
    },
    "filesExclude": {
        "**/.git": true,
        "**/.svn": true,
        "**/.hg": true,
        "**/.DS_Store": true,
        "**/Thumbs.db": true
    },
    "filesAutoSaveAfterDelay": false,
    "editorInlayHintsEnabled": true,
    "editorParameterHintsEnabled": true,
    "searchExclude": {
        "**/node_modules": true,
        "**/bower_components": true,
        "**/*.code-search": true,
        "**/build": true,
        "**/dist": true,
        "**/target": true
    },
    "workbenchSettingsEditor": "ui"
}
Custom browse configuration: 
{
    "browsePath": [
        "c:/users/<user>/programming/dungeongame/src",
        "c:/vulkansdk/1.4.309.0/include"
    ],
    "compilerPath": "c:/program files/microsoft visual studio/2022/community/vc/tools/msvc/14.43.34808/bin/hostx64/x64/cl.exe",
    "compilerArgs": [],
    "compilerFragments": [
        "/DWIN32 /D_WINDOWS /EHsc /Ob0 /Od /RTC1 -std:c++latest -MDd -Zi"
    ]
}
cpptools version (native): 1.23.6.0
Current database path: C:\USERS\<user>\APPDATA\LOCAL\MICROSOFT\VSCODE-CPPTOOLS\4EF2ADBBE509A7F8161209FFB9B6BB69\.BROWSE.VC.DB
Translation Unit Mappings:
[ C:\Users\<user>\Programming\DungeonGame\src\main.cpp - source TU]:
    C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\ucrt\stdio.h
    C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\ucrt\stdlib.h
    C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\ucrt\sys\stat.h
    C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.43.34808\include\vadefs.h
    C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.43.34808\include\xfilesystem_abi.h
    C:\VulkanSDK\1.4.309.0\Include\vulkan\vulkan_core.h
Translation Unit Configurations:
[ C:\Users\<user>\Programming\DungeonGame\src\main.cpp ]
    Process ID: 27464
    Memory Usage: 227 MB
    Compiler Path: C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.43.34808\bin\Hostx64\x64\cl.exe
    Includes:
        C:\Users\<user>\Programming\DungeonGame\src
        C:\VulkanSDK\1.4.309.0\Include
    System Includes:
        C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.43.34808\include
        C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.43.34808\atlmfc\include
        C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\um
        C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\ucrt
        C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\shared
        C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\winrt
        C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\cppwinrt
    Defines:
        WIN32
        _WINDOWS
    Standard Version: ms_c++latest
    IntelliSense Mode: windows-msvc-x64
Total Memory Usage: 227 MB

------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 5622
Number of files parsed: 596

Other Extensions

No response

Additional context

Please see this video for the performance issues outside of functions:
https://github.com/user-attachments/assets/8e01e049-797f-480e-b8af-9ae5d82f19af

[bobbrow]

Thank you for reporting this. Yes, we are aware of this problem, but I don't think we have a specific issue tracking it. We will use this one.

The nature of the parser we use for IntelliSense scans and maintains the outline in a preliminary pass on the code. Making changes in the global namespace modifies that outline and causes the parser to reset and perform that first pass over again, which can be slow. Making changes inside methods does not have that effect.