Oh, so that's why it was so slow.
@ -37,8 +37,8 @@ cmake .. ^
-DBUILD_TESTS=ON ^
-DBUILD_GL_TESTS=ON ^
-G "MinGW Makefiles" || exit /b
cmake --build . || exit /b
cmake --build . --target install || exit /b
cmake --build . -- -j || exit /b
cmake --build . --target install -- -j || exit /b
rem Test
ctest -V -E GLTest || exit /b