FPS Disparity between Solo and Multi


Hi guys I realized that there is a huge FPS performance disparity between Solo and Multiplayer. In multiplayer my fps stays between 60-90fps but for solo it drops to 30-50fps! May I know whether is this a bug or was it designed this way? Another question is that is there any way to reduce stuttering in Multiplayer? It stutters for 1-3s usually when i change my direction of view. stuttering gets pretty annoying especially in fights. Any help would be greatly appreciated. Thanks!
Currently using an Alienware x51 r2
8gb ram
gtx 760ti OEM 2GB DDR