https://www.gamespot.com/articles/black-ops-4s-battle-royale-mode-might-not-run-at-f/1100-6461591/

Part of what makes Call of Duty so compelling for some is how multiplayer runs at 60FPS, which makes the experience feel fluid and smooth. Now, Activision has said it cannot promise that Black Ops 4's battle royale mode, Blackout, will run at that frame rate.

Design director David Vonderhaar answered 195 of Game Informer's questions about Blackout, and one of them pertained to frame rate. Vonderhaar said Blackout technically can run at 60FPS, and he said 60FPS is always the target, but he suggested the game might not always achieve it.