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<topic xml:lang="en-us" id="settings-acceleration">
  <title>Acceleration Tab</title>
  
  <body>
    <p>On this tab, you can configure <ph conkeyref="vbox-conkeyref-phrases/product-name"/> to use hardware virtualization extensions that your host CPU supports.</p>
    <ul>
      <li>
        <p><b outputclass="bold">Paravirtualization Interface</b>: <ph conkeyref="vbox-conkeyref-phrases/product-name"/> provides paravirtualization interfaces to improve time-keeping accuracy and performance of guest OSs. The options available are documented under the <codeph>--paravirt-provider</codeph> option in <xref href="vboxmanage.dita"/>
          <cmdname>modifyvm</cmdname>. For further details on the paravirtualization providers, see <xref href="gimproviders.dita">Paravirtualization Providers</xref>.</p>
      </li>
      <li>
        <p><b outputclass="bold">Hardware Virtualization</b>:</p>
        <ul>
          <li>
            <p><b outputclass="bold">Nested Paging</b>: If the host CPU supports the nested paging (AMD-V) or EPT (Intel VT-x) features, then you can expect a significant performance increase by enabling nested paging in addition to hardware virtualization. For technical details, see <xref href="nestedpaging.dita">Nested Paging and VPIDs</xref>. For Intel EPT security recommendations, see <xref href="sec-rec-cve-2018-3646.dita">CVE-2018-3646</xref>.</p>
          </li>
        </ul>
      </li>
    </ul>
  </body>
  
</topic>
