iGPU means Integrated GPU sometimes my laptop used to run games with that instead of the dedicated GPU I had. This can be changed in nvidia control's panel.
Are you sure you're running it with the GPU and not the iGPU ? Look at nvidia's control panel --> 3D parameters,
Good budget card : GTX 750ti, GTX 950, R7 360, HD 7870 or the RX 480
Giant playground is a bad map to learn how to ABH because you get a lot of speed way to easily just by spamming your scrollwheel and you don't have any king of obstacles.
Crounch, walk into the portal strafe right until you get stuck
I'm in, I don't think this category requiers to be single segments, and since nobody respected it before I don't know why it would matter to use quicksaves now. Even glitchless runs doesn't need to be ss