UE4, and by extension Conan Exiles (and really just about every game out there) rely’s most on the speed and quality of what a single core processor can bring. UE4/Conan Exiles does allow multi core processes to happen, but the majority happens on a single core.
You have a 2.3GHz 3rd gen mobile I7 that is in no way shape or form optimized for operating a server. It does the job, but if you want better performance, an upgrade would be recommended I would say.
If you want a full breakdown, I bookmarked Tascha’s old post on the whole dealio.
But basically, video games have and continue to be optimized for single core useage. Applications in the real world that utilize multi-core are on the design side of things, such as rendering, simulation, game and software development, etc.