well after Fall of the Samurai they edited the shader files, and actually lowered Image Quality settings aka made some effects less noticeable removed some gloss effects and changed them not a big deal but imagine having gloss effects on each and every soldier now take that away
while the new patch has lowered vram usage the real motivation behind it was to make the game run on lower end hardware, sadly on most Total War forums, all they've done is piss ppl off for lowering image quality etc.
There will be another patch coming soon as well since the actually game engine code does work with AMD Radeon HD 7000 series GPUs the game freezes and hardlocks for most 12.3 WHQL offers some fixes, but cant fix all problems Creative Assemblies Game engine is just plain ancient and at this point is showing its age, with compatibility issues with gpus not just from AMD but Nvidia as well
As it stands modders are trying to fix it but sadly CA removed all the code needed to make it work so everyones shit out of luck as FOTS broke most players SHogun 2 and ROTS expansion on top of having GPU compatibility issues they are now lowering IQ across the board instead of just improving lowest settings Optimization.
Image 1 Fall of the Samurai DX11
https://www.sugarsync.com/piv/D7345538_4476061_66754
Image 2 Pre Fall of the Samurai DX11
https://www.sugarsync.com/piv/D7345538_4476061_66766
Image 3 Fall of the Samurai DX11
https://www.sugarsync.com/piv/D7345538_4476061_66642
Image 4 Pre Fall of the Samurai DX11
https://www.sugarsync.com/piv/D7345538_4476061_66640