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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 OSes. 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>
You can configure hardware virtualization features for each
virtual machine.
</p>
<ul>
<li>
<p><b outputclass="bold">Enable 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>
<p>Advanced users may be interested in technical details about hardware virtualization. See <xref
href="hwvirt.dita">Hardware Virtualization</xref>. </p>
</li>
</ul>
<p>In most cases, the default settings on the <b outputclass="bold">Acceleration</b> tab will work well. <ph conkeyref="vbox-conkeyref-phrases/product-name"/> selects sensible defaults, depending on the OS that you selected when you created the virtual machine. In certain situations, however, you may want to change the preconfigured defaults. </p>
</body>
</topic>
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