So yeah I have two identical Mac minis and the issue is only present on one of them. Very strange indeed. I can't turn off VBS because I need it for my work.
My host has 6 physical cores, while my VMs have between 2 and 4 processor cores assigned to them. On the one Mac mini where performance is excellent, performance is still great when I assign all 6 cores. For what it's worth, I cannot agree more with your other sentiments about Big Sur. I cannot fathom why I now have to live in perpetual loss of the lower left and lower right corners of my VM screens. The former is what I was offered for the first time tonight i.
Fusion didn't give me a pop-up window for it under Catalina. And selected. Update: I think I have found what makes this bug materialise. At least, I can now consistently reproduce my issue. See the attached screenshot. When the VM setting "Enable hypervisor applications in this virtual machine" is enabled, the issue is only present when "Memory integrity" is turned on inside the VM. Turning "Memory integrity" off vastly improves responsiveness, performance and brings the host CPU load under idle to reasonable levels.
Opening "My computer" inside the VM from a blank desktop took 9 seconds. This bug was not present before upgrading to macOS Big Sur. Opening "My computer" inside the VM is practically instantaneous. By more than a decade.
So that alone isn't gonna be the culprit here. Something comparable might still be causing the same thing. Are you running an antivirus in the guest?
The three I have up all require that I use Virtualization Based Security which seems to be the problem in Big Sur any sort of nested virtualization. I have an 8 core i9 16 logical cores total due to hyperthreading being enabled - In vmware it also reflects that my processor pool is 16 cores.
Something is wrong with Apple's hypervisor or VMware implementation in using it. Apple has probably just created a terrible hypervisor "middle-man" that is extremely bad at its job. Thanks for this idea at least - With the pain it took going back to Catalina from Big Sur My Time Machine restore wasn't working right, I had to create a bootable USB key and obtain the Catalina install app, which of course wasn't working per Apple's instructions and then install Catalina again and then do my Time Machine restore again.
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Best Apple Watch deals Save on the new Series 7. Latest comparisons. Each one really needs 2 cores to function well. Your best bet is to give the VM only 1 core and 4 GB of ram, and shut down everything else on the host.
You can try 2 cores for the guest, but you're likely to run into contention problems, especially if you do anything with any sort of load. In either case, I doubt that'll give you a decent experience. It's probably time to upgrade the machine. If you do, note that the M1 machines will not run intel guests nor are they likely to in future. The only other option is to run Windows 10 in boot camp mode not virtualized so that it's the only OS running at all.
Thanks for the tip. It is a MBP. A Mac notebook with 1. With hyperthreading this extends to four virtual cores, but those should not be counted when deciding how many cores to allocate to a VM and how many are left for the host, because virtual cores only count as a small fraction of a real core.
If you have this Mac model then the advice from dlhotka stands, and the Mac is not well suited to running a VM as there aren't enough real cores available as well as being limited on sustained performance and memory capacity.
If you have a MacBook Pro with four real cores then it cannot be 1.
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