I am having same issue it is driving me mad! I am losing so many fights due to these FPS drops.
Running Win 10, Nvidia driver 457.09
i9 9900K & RTX 2080
Game running at 1440p normally it stays between 143 FPS and 120 FPS with dips down to 100 FPS in bottom 1% but now I am averaging closer to 100 FPS on the new map and dips down to 40-50 FPS especially in grassy areas but also in other areas on the new map as well.
I already tried turning ALL the settings down to lowest just leaving the resolution at 1440p and it still gives the same performance as it does with all settings maxed out on the new map (wtf?) with dips down to 40-50 FPS in the same areas.
I already tried the Steam version as well just to see if the Origin one was corrupted, downloaded it fresh from Steam and tried it, same identical issue. All drivers are up to date and it can't be the hardware (i9 + RTX 2080 lol!)
Never had this issue before on the old maps.