Comment 5 for bug 1892369

separately remote iso mounting may be slow, thus you should try netbooting instead.

one can copy the kernel & initrd out of the iso. Boot them, with cmdline:
 ip=dhcp url=http://hostname/url/to/matching-full.iso

That way, initrd will establish networking and will download iso into ram, validate it very quickly, and boot.

This usually yields faster install times. If your target machine has enough RAM, something like more than 4GB.