Here is the fix for stuttering on Deus Ex: Mankind Divided PC Game:
-Enable shader cache with maximum pre rendered frame at 1 firstly.
- Force vsync from nvidia panel
- the 90% or more of the stuttering gone!
- Lower the settings
- Enable exclusive full screen
- Enable tripple buffering vsync or turn it off and force vsync on in the Nvidia control panel.
- Disable any overclock your CPU/GPU has (always good to try)
- Install to an SSD if possible