I cant find the reference immediately. But I read a couple of years ago that the numbers from Virtualbox’s guest always show inflated values but the ‘real-world’ performance is NOT as good as the numbers indicate. They are moderate.
Ideally you install plain Ubuntu/Centos or whatever in different hypervisors or vms and then run real WORLD programs to test.
Also if you just downloaded the vdi or ova or img from Bitrix - it may perform depending on the setup of the image.