I make small test between UE5.0 and UE5.4 at the same settings and third person project. This is the result.
On the UE5.4 I just play and don’t move the character, get 76 FPS. Turn off lumen for GI and reflection will make UE 5.4 run at 160 FPS but still bad if compare to UE 5.0 which can achieve 240+ FPS. After this I decide to rollback my city builder project using old version engine. (Ryzen 9 5900x + RTX 3060, at 1080p)