I use Ubuntu 12.04 64-bit and KVM, my CPU is Core i5 3.3 GHz and I have 8 GB of DDR3 RAM. I run Windows 7 in KVM and it's extremely slow. My co-worker use Debian on the same PC configuration and can run Windows 7 extremely fast! Where can be my problem?

sudo cat /etc/libvirt/qemu/windows.xml

<!--

WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE 

OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:

  virsh edit windows

or other application using the libvirt API.

-->



<domain type='kvm'>

  <name>windows</name>

  <uuid>5c685175-baea-0ca6-591f-8269d923ffb8</uuid>

  <memory>2097152</memory>

  <currentMemory>2097152</currentMemory>

  <vcpu>1</vcpu>

  <os>

    <type arch='x86_64' machine='pc-1.0'>hvm</type>

    <boot dev='hd'/>

  </os>

  <features>

    <acpi/>

    <apic/>

    <pae/>

  </features>

  <clock offset='localtime'/>

  <on_poweroff>destroy</on_poweroff>

  <on_reboot>restart</on_reboot>

  <on_crash>restart</on_crash>

  <devices>

    <emulator>/usr/bin/kvm</emulator>

    <disk type='file' device='disk'>

      <driver name='qemu' type='raw'/>

      <source file='/var/lib/libvirt/images/windows.img'/>

      <target dev='hda' bus='ide'/>

      <address type='drive' controller='0' bus='0' unit='0'/>

    </disk>

    <controller type='ide' index='0'>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>

    </controller>

    <interface type='network'>

      <mac address='52:54:00:94:63:91'/>

      <source network='default'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>

    </interface>

    <serial type='pty'>

      <target port='0'/>

    </serial>

    <console type='pty'>

      <target type='serial' port='0'/>

    </console>

    <input type='tablet' bus='usb'/>

    <input type='mouse' bus='ps2'/>

    <graphics type='vnc' port='-1' autoport='yes'/>

    <sound model='ich6'>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>

    </sound>

    <video>

      <model type='vga' vram='262144' heads='1'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>

    </video>

    <memballoon model='virtio'>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>

    </memballoon>

  </devices>

</domain>

UPD: I've enabled Intel-VT before installing KVM. I've also installed VirtIO drivers, so my Virtual Machine with Windows 7 has disk like this: