Try turning off Core 0 and 1, via Task Manager. See what that does, I only suggest as I read this was allowing the other cores to be used more evenly. I haven't tried it, don't have a reason to on my end.
Regarding the Stuttering, have you tried the Streaming Texture Toggle in the Config file? Almost everyone that has, said it fixes the scroll stuttering, it puts more textures into memory.
FWIW this is what I get using Afterburner: (i7 3820)
Core 1 68
Core 2 25
Core 3 25
Core 4 45
100% GPU Usage. (Nvidia 760)
This tells me vs yours the game still has some work to do with some pc configs.
EDIT: (Here is the core post)
Ok guys, temp fix came from Tornis twitchtv chat (i am watching him since release), so i wanted to share here.
This is for 4 core (8 thread) cpus, and may work for other CPUs also.
Start tast manager > find game .exe (i dont know exact name) > right click that name > Set Affinity > Disable only CPU 0 and CPU 1 (CPU 2 3 4 5 6 7 active)
without this tweak, one core almost always %100 , %30 , %5 , %5 etc
With this tweak , one core almost %50-85 , %30-60, %15-45, %5-15
I made up numbers but you got the idea i think...
I will share here if more usefull tweaks like this talked on Tornis's chat.
Thanks, I'll try it tomorrow. But if it is that easy why isn't it implemented in the game???

@Stargazer
Relax, mate, I only wanted to say that there is a lot of space for improvement and optimization. You're certainly right about the capacities of Ubisoft or other big companies of course. But you should always compete with the best or the biggest. I'm quite sure that other studios in the same position as Larian would have come up with WAY less. For the size of the studio and the budget available D:OS is technically a great game with a proprietary engine...
