Modern Warfare Remastered is notoriously hungry for Video RAM (VRAM). If your graphics card has less than 8GB of VRAM, maxing out the settings will cause severe performance degradation.
The engine used for MWR is notorious for poor CPU core distribution, sometimes pinning Core 0 to 100% while leaving other cores idle. callofdutymodernwarfareremasteredcodex better
: Mods that bring weapons from Modern Warfare 2019 or MW2 into the MWR engine. Modern Warfare Remastered is notoriously hungry for Video
: Lower "Shadow Map Resolution" to "Medium" or "Low" for a massive FPS boost. callofdutymodernwarfareremasteredcodex better
: Higher sensitivity allows for the quick "flick" shots required for the training course and high-intensity multiplayer.