How to use precompiled header files in vscode?

I using vscode for C++ and coderunner to run the code and I don't have any build configuration setup as well as not using any package manager like Cmake or Conan.

I precompiled some header files and included that in the source file. It seems working but the compilation is very slow and I don't see much difference between before and after including precompiled header files.

I have also installed C/C++ extension.

What is the correct way to do it?