Word on the street from owners of the Xbox One edition of Call of Duty: Ghosts is that the Onslaught DLC and accompanying stability patch have been a significant setback for the game's performance in multiplayer, and Eurogamer's Digital Foundry has tested and confirmed some consistent frame drops in certain spots on the new maps.
"Kicking off with a look at Stonehaven, it's immediately obvious that things are not quite right. While the game does indeed hit 60fps in this stage, frame-rates are dramatically impacted when the whole level is in view, with metrics varying between 46-60fps as we run across the landscape," Digital Foundry's David Bierton wrote. "As frame-rates fall below the desired 60fps target, we also see the appearance of some screen-tear, adding some judder, making drops in smoothness more noticeable."
DF also notes that looking down a sniper scope drops the framerate even further to nearly 30. On other new maps, they say any performance hits are less notable than those in Stonehaven, and that despite hyperbolic complaints from some folks the game is not "significant;y broken." Patches that hamper performance are always sad, though.