Hello, I am another one of the guys who experience severe stuttering, especially in sieges.
I have a GTX 970 and i7-5820k oc'd@ 4.00Ghz, 16 GB DDR4 Ram and SSD...it has nothing to do with my specs, since I can play large sized battles in custom battle mode without experiencing anything gamebreaking, but the SP just stutters too much it makes it unplayable.
I think it has to do with enemy AI, since even on very low I still experience this stuff...please optimize this!
Hope you can fix this! Stuttering aside, this game is THE dream!