I have recently upgrade the host from windows 7 up to windows 10 and I have noticed that my virtualbox is now 200% slower using an ubuntu guest OS. I have 16 GB of RAM with 4 GB allocated to the VM. I have tried with both 4 cores and 2 cores on the VM still no difference. I have an i7-2600 4 core machine + 4 ht cores.
Is this a known issue? How can I debug this further? I know it is a CPU problem but I am not sure how to resolve this.
I have gathered perfomance metrics for Hyper-V and VirtualBox and it seems that VirtualBox beats Hyper-V in all aspects apart from the CPU which is twice as slow.
Virtualbox https://browser.geekbench.com/v4/cpu/12206247
Hyper-V https://browser.geekbench.com/v4/cpu/12206485/claim?key=124499
Note: I do notice that the CPU is utilised at 50% (I have assigned 4 out of 4 physical cores), however the performance of the CPU is slow.
Best Answer
After looking at the Virtual box hardening logs there is the log item of:
NtOpenDirectoryObject failed on \Driver: 0xc0000022
After running Virtualbox with administrator rights it seemed to go as fast as normal. This does seem to be a Virtualbox issue. I have tried this on 3 different machines all running windows 10 as the host and the same error message comes out.