Autocomplete becomes really slow when including thir... | microsoft/vscode-cpptools

Type: LanguageService

Describe the bug

OS and Version: macOS Catalina (10.15.6)
VS Code Version: 1.47.3
C/C++ Extension Version: 0.29.0
Other extensions you installed (and if the issue persists after disabling them): CMake, CMake Tools
Does this issue involve using SSH remote to run the extension on a remote machine?: No
A clear and concise description of what the bug is, including information about the workspace (i.e. is the workspace a single project or multiple projects, size of the project, etc).

I am trying to implement simple demo from https://pytorch.org/cppdocs/frontend.html. The problem occurs when I include #include <torch/torch.h>. The auto complete would not show up for seconds, sometimes it doesn't even show up and I need to force it by pressing ^+Space. I expect to have a cache file generated on the default path to cache the precompiled headers from that library, however I couldn't find it. I also tried to change the cache path, but still no files are generated.

Steps to reproduce

Copy and follow instruction in https://pytorch.org/cppdocs/frontend.html on End-to-end Example section
Include #include <torch/torch.h>
Start typing. In my case even typing struct would not show any the auto complete at all

The following is my settings.json

{
    "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools"
}

I don't use c_cpp_properties.json
And the following is my settings.json when I tried to change the cache path

{
    "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools",
    "C_Cpp.intelliSenseCachePath": ".vscode"
}

I only find ipch/<some_hash_id> folder inside .vscode, no files are generated

Expected behavior

Instant suggestion for autocomplete

C/C++: Log Diagnostics

-------- Diagnostics - 7/30/2020, 9:06:27 PM
Version: 0.29.0
Current Configuration:
{
    "name": "Mac",
    "includePath": [
        "${workspaceFolder}/**"
    ],
    "defines": [],
    "macFrameworkPath": [],
    "compilerPath": "/usr/local/bin/gcc-10",
    "cStandard": "c11",
    "cppStandard": "gnu++14",
    "intelliSenseMode": "clang-x64",
    "compilerArgs": [],
    "configurationProvider": "ms-vscode.cmake-tools",
    "browse": {
        "path": [
            "${workspaceFolder}/**"
        ],
        "limitSymbolsToIncludedHeaders": true
    }
}
Custom browse configuration: 
{
    "browsePath": [
        "/volumes/workspace/learning/torchcpp/build/cmakefiles",
        "/volumes/workspace/learning/torchcpp/third_party/libtorch/include",
        "/volumes/workspace/learning/torchcpp/third_party/libtorch/include/torch/csrc/api/include",
        "/volumes/workspace/learning/torchcpp"
    ],
    "standard": "gnu++14",
    "compilerPath": "/usr/bin/clang++",
    "compilerArgs": [
        "-g",
        "-isysroot",
        "/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk",
        "-std=c++14",
        "-std=gnu++14"
    ]
}
Custom configurations:
[ /Volumes/Workspace/learning/torchcpp/main.cpp ]
{
    "defines": [],
    "standard": "gnu++14",
    "includePath": [
        "/volumes/workspace/learning/torchcpp/third_party/libtorch/include",
        "/volumes/workspace/learning/torchcpp/third_party/libtorch/include/torch/csrc/api/include"
    ],
    "intelliSenseMode": "clang-x64",
    "compilerPath": "/usr/bin/clang++",
    "compilerArgs": [
        "-g",
        "-isysroot",
        "/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk",
        "-std=c++14",
        "-std=gnu++14"
    ]
}
Translation Unit Mappings:
[ /Volumes/Workspace/learning/torchcpp/main.cpp ]:
    /Volumes/Workspace/learning/torchcpp/main.cpp
Translation Unit Configurations:
[ /Volumes/Workspace/learning/torchcpp/main.cpp ]:
    Process ID: 32992
    Memory Usage: 113 MB
    Compiler Path: /usr/bin/clang++
    Includes:
        /Volumes/Workspace/learning/torchcpp/third_party/libtorch/include
        /Volumes/Workspace/learning/torchcpp/third_party/libtorch/include/torch/csrc/api/include
        /Library/Developer/CommandLineTools/usr/include/c++/v1
        /Library/Developer/CommandLineTools/usr/lib/clang/11.0.3/include
        /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include
        /Library/Developer/CommandLineTools/usr/include
    Frameworks:
        /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/System/Library/Frameworks
    Standard Version: c++14
    IntelliSense Mode: clang-x64
    Other Flags:
        --clang
        --clang_version=110003
Total Memory Usage: 113 MB

Language Server Logs

textDocument/didChange: file:///Volumes/Workspace/learning/torchcpp/main.cpp
cpptools/textEditorSelectionChange
textDocument/didChange: file:///Volumes/Workspace/learning/torchcpp/main.cpp
cpptools/textEditorSelectionChange
textDocument/didChange: file:///Volumes/Workspace/learning/torchcpp/main.cpp
cpptools/textEditorSelectionChange
textDocument/didChange: file:///Volumes/Workspace/learning/torchcpp/main.cpp
cpptools/textEditorSelectionChange
cpptools/getFoldingRanges: file:///Volumes/Workspace/learning/torchcpp/main.cpp (id: 553)
textDocument/didChange: file:///Volumes/Workspace/learning/torchcpp/main.cpp
cpptools/abortRequest
cpptools/textEditorSelectionChange
textDocument/documentHighlight: file:///Volumes/Workspace/learning/torchcpp/main.cpp (id: 554)
sending 1 changes to server
sending 1 changes to server
sending 1 changes to server
sending 1 changes to server
sending 1 changes to server
cpptools/finishUpdateSquiggles
Error squiggle count: 9
Update IntelliSense time (sec): 3.702
cpptools/getFoldingRanges: file:///Volumes/Workspace/learning/torchcpp/main.cpp (id: 555)
textDocument/completion: file:///Volumes/Workspace/learning/torchcpp/main.cpp (id: 556)
auto_complete::handle_completion: file:///Volumes/Workspace/learning/torchcpp/main.cpp (47:7)
Offering completion
cpptools/getCodeActions: file:///Volumes/Workspace/learning/torchcpp/main.cpp (id: 557)
cpptools/getSemanticTokens: file:///Volumes/Workspace/learning/torchcpp/main.cpp (id: 558)
cpptools/getCodeActions: file:///Volumes/Workspace/learning/torchcpp/main.cpp (id: 559)
textDocument/didSave: file:///Volumes/Workspace/learning/torchcpp/main.cpp
cpptools/fileChanged: file:///Volumes/Workspace/learning/torchcpp/main.cpp
cpptools/getDocumentSymbols: file:///Volumes/Workspace/learning/torchcpp/main.cpp (id: 560)
cpptools/getDocumentSymbols
  tag parsing file: /Volumes/Workspace/learning/torchcpp/main.cpp
completionItem/resolve (id: 561)
idle loop: reparsing the active document
Checking for syntax errors: file:///Volumes/Workspace/learning/torchcpp/main.cpp
Queueing IntelliSense update for files in translation unit of: /Volumes/Workspace/learning/torchcpp/main.cpp
cpptools/finishUpdateSquiggles
Error squiggle count: 10
Update IntelliSense time (sec): 0.26
cpptools/getSemanticTokens: file:///Volumes/Workspace/learning/torchcpp/main.cpp (id: 562)
cpptools/getCodeActions: file:///Volumes/Workspace/learning/torchcpp/main.cpp (id: 563)
Database safe to open

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Additional context

Autocomplete becomes really slow when including third party library

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