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.

<?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);

?>