Response time for unattended access increases when no monitor attached

I want to run a headless Linux machine. When I have a monitor plugged into it, the response time with unattended access is great. When I unplug the monitor from the machine, lag time goes to 5-6 seconds.

Has anyone seen this before?

Thank you.

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Release Notes: Version 1.91, February 2015
Unattended Access (Beta) is live! Unattended Access, a feature requested by a lot of our customers is live now. Currently, it's in beta. You can add up to 100 computers per Technician subscription. They can also be accessed by your organization members. My Computers list in Zoho Assist home page will always display the online status of your unattended computers. You can rename the computers whenever you wish. Currently, Unattended Access can be configured only for Windows computers. Nevertheless,