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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<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>
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