Go to Definition slow

Environment

• OS and Version: Windows 11 x64
• VS Code Version: 1.104.2 (also tried a few olders)
• C/C++ Extension Version: 1.27.7
• If using SSH remote, specify OS of remote machine: WSL2 (Ubuntu 24.04.2 LTS) + Devcontainer

Bug Summary and Steps to Reproduce

Bug Summary:
v1.27.7 Go to Definition takes ~2-3 seconds, while v1.26.5 works instantly.

Steps to reproduce:

1. Use Go to Definition on a moderate sized C CMake project (~400 h+c files, ~88k SLOC)
2. Fire Intellisense (Ctrl + Space) - slower compared to v1.26.5 by 1-2 seconds

Expected behavior:

Configuration and Logs

_settings.json_:

  "C_Cpp.intelliSenseEngine": "default",
  "C_Cpp.files.exclude": {
    "**/.vscode": true,
    "**/.vs": true,
    "build/**": true
  },
  "files.watcherExclude": {
    "build/**": true
  },


_c_cpp_properties.json_

{
    "configurations": [
        {
            "name": "ESP-IDF",
            "compilerPath": "${config:idf.toolsPathWin}\\tools\\xtensa-esp32s3-elf\\esp-2021r2-patch3-8.4.0\\xtensa-esp32s3-elf\\bin\\xtensa-esp32s3-elf-gcc.exe",
            "compileCommands": [
                "${workspaceFolder}/build/compile_commands.json"
            ],
            "includePath": [
                "${config:idf.espIdfPath}/components/**",
                "${config:idf.espIdfPathWin}/components/**",
                "${config:idf.espAdfPath}/components/**",
                "${config:idf.espAdfPathWin}/components/**",
                "${workspaceFolder}/**"
            ],
            "browse": {
                "path": [
                    "${config:idf.espIdfPath}/components",
                    "${config:idf.espIdfPathWin}/components",
                    "${config:idf.espAdfPath}/components/**",
                    "${config:idf.espAdfPathWin}/components/**",
                    "${workspaceFolder}"
                ],
                "limitSymbolsToIncludedHeaders": false
            }
        }
    ],
    "version": 4
}

Other Extensions

Disabling / enabling other extensions does not seem to have any effect

Additional context

No response

Reproduce the regression in a moderate C/CMake project using the provided compile_commands.json configuration, then compare Go to Definition and Ctrl+Space between C/C++ extension versions 1.26.5 and 1.27.7. Profile the relevant extension behavior and validate that both actions return to the earlier responsiveness without breaking the supplied Windows, WSL2, or devcontainer setup.