There appears to be an upstream issue with grub2 and the uefi pxe implementation. This will cause exceptionally slow boot times for anyone using pxe on aarch64/arm64 systems(and in some cases x86_64 if I'm reading this right). We're working to see how this can best be addressed. It's possible that we may have to wait for the 'official' fix to come in the 7.3 sources, but if we can fix it sooner in a clean fashion we will. For anyone interested in taking a swing at applying (and sharing) the patch to the 7.2 grub2 codebase before we're able to put out a fix, the upstream thread can be found here -> http://lists.gnu.org/archive/html/grub-devel/2015-04/msg00065.html -- Jim Perrin The CentOS Project | http://www.centos.org twitter: @BitIntegrity | GPG Key: FA09AD77