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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic id="ts-hyperv">
<title>Poor performance when using <ph conkeyref="vbox-conkeyref-phrases/product-name"/> and <b outputclass="bold">Hyper-V</b> on the same host</title>
<body>
<dl>
<dlentry>
<dt>Details</dt>
<dd><ph conkeyref="vbox-conkeyref-phrases/product-name"/> and <b outputclass="bold">Hyper-V</b> can conflict with each other when run on the same host.<p>Always disable Hyper-V when running VirtualBox.</p></dd>
</dlentry>
<dlentry>
<dt>Workaround</dt>
<dd>
<p>Turn off the Windows features Hyper-V Platform, Virtual Machine Platform and Windows Hypervisor Platform, and then reboot the host.</p>
<p>On newer Windows versions, the device security features Core Isolation and Memory Integrity use Hyper-V, even if you have turned it off.</p>
<p>Use the Microsoft Device Guard and Credential Guard hardware readiness tools to turn off more features that use Hyper-V. For example, to disable AutoReboot, use the following command: </p>
<pre xml:space="preserve">.\DG_Readiness_Tool_vX.X.ps1 -Disable -AutoReboot</pre>
<note>
<p>Disabling Device Guard and Credential Guard features impacts on the overall security of the host. Take this into account before deciding to disable them.</p>
</note>
</dd>
</dlentry>
</dl>
</body>
</topic>
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