At those settings, you might be seeing a consistent 30fps. You tend to get used to that if that's what you see all the time.
What people in somewhat higher tier hardware are seeing is an average >60fps, but with sudden dips down below 35fps. That inconsistency is very noticeable as stutters. This seems to happen even all the way up to an rtx4090 running at 1080p. The game seems to hit some bad CPU bottlenecks, and no CPU on the market can fix it.