When running the demoshop with the DevVM it may sometimes happen that the VBoxHeadless process at the next startup is at 100% CPU load with no obvious reason.
It turned out, that the audio support may be the reason for that behavior. If the audio support is de-activated in the virtual machine (VirtualBox), the problem does not show up.
Starting from DevVM version 2.3.1 audio support is disabled by default in the configuration file.
If you have open questions, please do not hesitate to submit a ticket.