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Some users have reported a drop in fps that continues until the game is closed.
Set D3D11_CREATE_DEVICE_PREVENT_INTERNAL_THREADING_OPTIMIZATIONS to 1. Go to HKEY_CURRENT_USER\Software\Eidos\Deus Ex: HR Nacht der Untoten (German for Night of the Undead), also known as Night in the Rezurrection poster, is the first Zombies map featured in Call of Duty: World. The last possible solution would be to use DX11 mode (VSync enabled) and then go in to the registry. Reinstall the redists located in redist in the installation folder, then restart your computer. If you're playing in DX9 mode, you may try using Boris Vorontsov's ENBSeries SPEED IMPLANT. Stuttering can also be reduced by turning off triple buffering in the game menu. If this doesn't fix stuttering in fullscreen but does fix it in windowed mode for Windows 7 users, right-click 'dxhr.exe' and open the Properties window, then navigate to the Compatibility tab and check 'disable visual themes' and 'disable desktop composition.' This could possibly fix stuttering in fullscreen. If you press Alt+ ↵ Enter the game will go back to fullscreen, but the stuttering should be gone.
Change the ingame setting "fullscreen" to "no".
There are multiple solutions that people have reported work: