How does ghost start slowly?

How does ghost start slowly?

A few days ago, when I installed a new batch of machines in netke, I suddenly found that the ghost startup speed on these machines was very slow. We suspect that this motherboard or the chipset was the cause, because the same ghost file is normal on another motherboard.

　
The device that may cause this problem can be ruled out by disabling the BIOS. The IDE controller still has no effect, but can't help but stay in the BIOS, over and over again, I looked at the options that may be related to this problem in the BIOS. When I was about to find out why the BIOS interface was blue, I suddenly saw the option that I never thought of, USB!

Disable usb controller restart and GHOST will enter the menu in less than 3 seconds. Yes, it's a problem with the usb controller!
　
However, I'm glad not to be too early. This time, I maintained two Internet cafes with nearly 400 computers on the motherboard, And it was terrible to close each usb controller. So I guess there should be no usb device parameter for ghost, so I found the GHOST parameter on Baidu and GOOGLE and finally found it, which is "-nousb"

Nousb !! In this simple way, I have gained an experience: when using a software, you may try this function in the most possible way if you don't know whether the software has this function, maybe the author has come up with this function!