High CPU Usage and Low Performance in Path of Exile 2

Just bought the game and I'm experiencing high CPU usage as well.

+ CPU: 12th Gen Intel(R) Core(TM) i9-12900K (Frequent 100% across multiple cores)
+ GPU: NVIDIA GeForce RTX 3080 @ 1920x1080 no upscaling (40-60%)

Running the latest drivers available.