There is no way to isolate things based on their polling rate that I am aware of.
The fact that it happens with no client open and only on a particular project, indicates to me that you should be looking in a Gateway Event Script.
- Gateway Event Scripts are considered a project resource and so would be isolated to a single project
- They run on the gateway and so do not require any sessions or clients to be open
- If these were the result of a Tag Change Script, or Query Tag Polling then it would be across all projects (unless the projects are on separate gateways).
- Any script on a window would require a client to be running
- Client Event Scripts require a client to be running
The fact that this is so cyclical would lead me to the Timer Events, particularly those with a 10,000ms delay/rate.