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Here are the steps to speed up C++ compilation time by precompiling the "bits/stdc++.h" header on a Windows machine and modifying CodeBlocks' settings to use them:

1. Delete the Mingw compiler from CodeBlocks and remove Mingw from PATH if it is present.

2. Download the latest version of msys2.

3. Open the MSYS2 shell from the start menu and execute the following commands:

• Update the package database by running pacman -Sy pacman.
• Update the package database and core system packages with pacman -Syu.
• Update the remaining packages with pacman -Su.
• For a 32-bit system, install the 32-bit toolchain by running pacman -S mingw-w64-i686-toolchain. For a 64-bit system, install the 64-bit toolchain with pacman -S mingw-w64-x86_64-toolchain.

1. Open the Command Prompt as an administrator, navigate to the C: drive, and execute mklink /D MingGW C:\msys64\mingw64.

2. Edit the system environment variables by going to "Environment Variables," double-clicking on PATH, and adding C:\MinGW\bin as a new entry.

3. Open the Command Prompt and navigate to the path C:\MinGW\include\c++\13.2.0\x86_64-w64-mingw32\bits.

4. Execute the following 8 commands in the Command Prompt:

• g++ -fexceptions -g -std=c++17 stdc++.h -O0 -o stdc++_17_O0.gch
• g++ -fexceptions -g -std=c++17 stdc++.h -O1 -o stdc++_17_O1.gch
• g++ -fexceptions -g -std=c++17 stdc++.h -O2 -o stdc++_17_O2.gch
• g++ -fexceptions -g -std=c++17 stdc++.h -O3 -o stdc++_17_O3.gch
• g++ -fexceptions -g -std=c++20 stdc++.h -O0 -o stdc++_20_O0.gch
• g++ -fexceptions -g -std=c++20 stdc++.h -O1 -o stdc++_20_O1.gch
• g++ -fexceptions -g -std=c++20 stdc++.h -O2 -o stdc++_20_O2.gch
• g++ -fexceptions -g -std=c++20 stdc++.h -O3 -o stdc++_20_O3.gch

1. Create a new folder named stdc++.h.gch in C:\MinGW\include\c++\13.2.0\x86_64-w64-mingw32\bits, and move all the previously generated files into it.

2. Open CodeBlocks and navigate to "Compiler Settings," "Global Compiler Settings," "ToolChain Executables." Set the compiler's installation directory to C:\msys64\mingw64.

3. In CodeBlocks, go to "Compiler Settings," "Global Compiler Settings," "Compiler Flags," and check the box for [-O2] under "Optimization."

4. In CodeBlocks, go to "Compiler Settings," "Global Compiler Settings," "Other compiler options," and add -std=c++17 or -std=c++20 ( important ).

5. In CodeBlocks, go to "Debugger Settings Default," "Executable path," and paste C:\msys64\mingw64\bingdb.exe.