1920x1200 resolution and it seems that the videos dont lag in a small window. I know I'm not alone with this issue but the more people who confirm this is the cause then hopefully the fusion team will see this and address is once and for all. Select Apple Mac OS X in the Guest operating system section and select. Although that will work in some cases, there might be. I would much appreciate it if you'd give me a follow-up after trying all of this. When creating a new VM, your inclination might be to bump up the RAM used to ensure a smooth running guest. Not a little bit, not a lot, but completely makes it unusable in my case. Should help, as I have spent hours previously trying to figure out why these options DESTROY the performance entirely. If it's on, disable it and make sure you do reboot as it asks. A possible workaround can be to use the Intel HD Audio controller in VirtualBox and disable its power saving by adding the following line in a file in /etc/modprobe.

You should find 'Core Isolation' and then 'memory integrity' and you will want to confirm this is disabled. In some cases, audio can have laggy performance (for example lag behind video when streaming video online). Then restart VM, and once in windows, open windows defender/security and go to the device security tab (not positive this is what it's called, going strictly off memory here for all this).

try disabling all these options I mentioned. Do you have virtualization-based security enabled in the vm's advanced settings? If so, try disabling that, and also check in the processors & management tab -> advanced options -> you will see enable hypervisor and enable IOMMU.

Macos virtualbox laggy