A sharp drop in FPS and slowdowns on large maps. RX 9060 XT + Ryzen5 2600

I play deathmatch at high settings and get stable 70-75 frames in 1080p. The performance is the same in company mode. But in Capture and Breakthrough modes, fps stays around 30-50, frame time grows wildly and the game slows down.

I tried to set the minimum settings, turn on the FSR, set the resolution lower down to 1024x124. I tried to include and disable Adrenalin Fluid Motion Frames, FSR4. Deleted HD textures. Nothing helps.

I understand that the processor is ancient, but it is included in the minimum requirements, I have a great performance in company and small modes. And the difference between "Good performance at high settings" and "Absolutely unplayable at low levels" is too high within a pair of modes.

 I played beta on an RX580 with the same processor. There weren't many shots, but they were smooth. Maybe I haven't tried something else?