In the downtown of Urzikstan, if you have Resizable Bar (Intel) or Smart Access Memory (AMD) enabled it will drastically reduce your FPS in Warzone and Zombies. These features work amazing in multiplayer but the Urzikstan map doesn't utilize them properly. I gained 100fps average disabling this CPU feature and now average around 280fps in Warzone with a 5800x3d and a 7900 xtx. With SAM enabled it drops to 150fps lows. I also tested this with my RTX 3080 on my Intel system with Resizable Bar Enabled and saw the same issue, I lost about 50 FPS because the 3080 is so much slower than the 7900xtx.

Note: This is not new, it has been a problem in Zombies since launch.