With 4 threads, performance will suffer. Our minimum supported is quad-core, 8 threads. Your CPU should support hyper threading which should help with performance, but it appears has been turned off. The should help performance.
On low-spec computers, you can also run on the engine page instead of the map page and less will happen in the background. Someone on our beta team was running on a 2xxx series i5 4 thread CPU and was able to work with that, though I expect their X-Plane settings weren't set so high.