High CPU usage

If you have an eye tracker with head tracking support, the Tobii Service can run a bit high on CPU when you are using head tracking since that data cannot be processed on the EyeChip so it is fully processed on your PC.

Then what could help is setting the Tobii Service to run on high priority so it does not get choked by other processes. 

Go to Task Manager - Details
Then right-click on Tobii.Service.exe - Set priority - High