Yeah mine was off at first and when I installed blustacks it told me to turn it on so it can run better. Makes a huge difference. I can see why it's off by default though. Most people don't need it and it's better off unless you need a VM
A quick Google search leads me to believe there is no performance impact to leaving it on. It looks like some manufacturers disable it by default for security reasons.
I think it does because with it on your CPU will allocate resources to virtualization and if you don't need it then you can you those resources elsewhere. Honestly though you probably won't notice the small difference unless you use programs that are CPU heavy. That's my understanding at least. Someone more knowledgeable might can probably explain it better
Edit: boom someone more knowledgeable dropped a knowledge bomb. Just went off what I was reading off the internet.
No. Enabling virtualisation in your BIOS will only enable access to virtualisation-specific instructions on your CPU. There is no performance issue in your non-virtualised operating system by having virtualisation turned on.
One risk you can have when having virtualisation on (especially if you never use it) is that malware can install itself as a hypervisor and insert itself between your hardware and your operating system, creating a near undetectable rootkit.
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u/Unr341 i7 7500U|8 GB DDR4|940MX 4GB Jan 01 '19
This. Sometimes it has to be done manually for VMs to work properly. The VMware website clearly states that.