Reproducing numbers from the tutorial

I am learning about LXC and LXD and am trying to reproduce numbers from
I am not able to do so.
I am using a VM in the cloud with 16 cores CPU but getting 4 times bigger numbers - e.g. starting 100 alpine containers in 20seconds instead of 5 seconds.
Can you please help me understand why I’m seeing such a big difference?
I’d like to adjust my VM so I can achieve the same.