I had this happening on my old machine the last 3 years or so, when you start the client it has super low FPS … waiting a couple of minutes and it suddenly goes to normal for the rest of the session. Nothing you can do about, no setting no activity. It was a major issue for me when disconnected while in fleet/combat. Also it forced me to stay in a citadel overnight or I wouldn’t be able to safe undock after login.
It’s not happening with my new rig, at least I do not notice, as the machine in 10x faster.