After I typed this command, only the two lines of INFO are printed, and there is a file was created and the size is growing, but too slowly.
Is there any way to speed up repack-windows?
There’s no way of speeding this up. The driver ISO needs to be downloaded. However, if you’re able to download it yourself (not via distrobuilder) and move it to the correct directory, distrobuilder will use it instead of downloading it again.