Hi, I've tested this script on centos 6.5 (libvirt-0.10.2, qemu-kvm-0.12.1.2) and ubuntu server 14.04 (libvirt 1.2.2, qemu-kvm 2.0.0) with the same result. The created vm is very slow compared to the vm created with virt-manager, with the same features/devices on the same host. Can you suggest any configuration that can avoid that slowness? With regards Mario D. <?php $conn = libvirt_connect('null', false); $name="testvm"; $arch="x86_64"; $memMB=1024; $maxmemMB=1536; $vcpus=1; $iso_image="/home/iso/CentOS-6.5-x86_64-minimal.iso"; $disk1 = array( "path" => "/home/vm/centos-script.raw", "driver" => "raw", "bus" => "virtio", "dev" => "hda", "size" => "6G", "flags" => VIR_DOMAIN_DISK_FILE | VIR_DOMAIN_DISK_ACCESS_ALL ); $disks = array( $disk1 ); $network1 = array( 'mac' => '00:11:22:33:44:55', 'network' => 'default', 'model' => 'e1000' ); $networks = array( $network1 ); $flags=VIR_DOMAIN_FLAG_FEATURE_ACPI; $newdom=libvirt_domain_new($conn, $name, $arch, $memMB, $maxmemMB, $vcpus, $iso_image, $disks, $networks, $flags); print_r($newdom); ?>