it seems windows defender (or similar) is still running on the background.
if you are windows make sure you go to windows defender configuration and set a folder (not file) exemption for the entire /xplane 11/ root folder, this should cure the problem
Otheriwse please try going to taskbar and see what process is killing the cpu
Ramzzess Aviation Design and Philipp Avionics have released their eagerly awaited 777-200LR project! This aircraft is said to have been worked on closely with real-world 777 pilots, engineers, and 777 3D CAD files provided by Boeing. The aircraft simulates many systems, including the Electronic Flight Bag and a custom FMC. You can find more information or purchase this aircraft for $59.95 from the X-Plane.org Store.