Windows 7 guest works slowly on Windows Server 2012 R2 host

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Windows 7 guest works slowly on Windows Server 2012 R2 host

Postby SlitherViper » 14. Nov 2017, 20:42

Has anybody had this problem? I'm running Virtualbox 5.2 on Windows Server 2012 R2 (2x10-core Xeon E5) and I tried installing Windows 7 in a guest VM.

If I give it a desktop-PC-strength CPU power and RAM, like 16GB and 4 cores, it runs smoothly, but when I gave it 128GB RAM and 16 or 32 cores*, it ran extremely slowly. The Windows logo animation proceeded in extreme slo-mo and took about 10-20 min and the setup itself took hours. After it was done, the new OS worked a bit faster than that, but after I opened Control Panel it completely froze when I tried to close it. All the while it was using about 20-30% of host's total CPU power.

So I powered it off, set the new VM's settings to 16GB and 4 cores and again it works still a little slow, but much faster than with stronger settings. What's the deal? :?

* edit: forgot to add, I tried with 16 cores in case VBox isn't using hyperthreading properly but the same thing happens
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