February 2019
I've just found a fix for my game. I had high cpu priority set on bf5, after switching it back to normal there is no more mouse lag but unfortunately I have bigger fps drops now.
February 2019
Today i set my cpu priority do normal and disabled razer Cortex, played a round of operations without stuttering
March 2019
Bumping this up. Can't play anymore due to the mouse lag that doesn't manifest as much as stuttering as just weird sensitivity variations.
If I set my CPU priority to high the sounds starts to cut off, so it's not a solution.
Switching to DX11 drops performance from 90 - 105 FPS to 45 - 60 so not a solution as well.