GLFW has long delay when creating a window


I’m using GLFW for the first time. Pulled the latest stable release (3.2.1) and I’m using the example code found on the GLFW website:

#include <GLFW/glfw3.h>

int main(void)
    GLFWwindow* window;

    /* Initialize the library */
    if (!glfwInit())
        return -1;

    /* Create a windowed mode window and its OpenGL context */
    window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
    if (!window)
        return -1;

    /* Make the window's context current */

    /* Loop until the user closes the window */
    while (!glfwWindowShouldClose(window))
        /* Render here */

        /* Swap front and back buffers */

        /* Poll for and process events */

    return 0;

There’s a fairly long delay (20 seconds or so) on the call to choosePixelFormat() (wgl_context.c) - nativeCount has a value of 627 and it seems to just take a long time in the for loop.

There’s no delay if I use freeGLUT to create a window or if I just create a window directly with WinAPI calls (CreateWindow, etc) and set up the PFD myself.

I’m using Windows 10, tried it first with Visual Studio 2015 and then in 2017. Graphics card is NVidia Quadro M6000.

I did slightly modify the above code to add a call to initialize glew, but having this call or not did not change the delay.


That’s a ridiculously long time. Can you get more detailed information on what inside of choosePixelFormat is taking so long and whether it’s on the first iteration or across them all?