Setup
i7 7700K
GTX 1080 Ti
16GB RAM
Installed on 256GB NVMe drive
Resolution: 1440p@144Hz, Fullscreen, tried both VSync on and off, no noticeable effect here
Battle size: 500
Most 'Performance' settings on High, Shadows on Medium, Turned off Bloom and Motion Blur
Fiddling around with video options did not seem to do much (although I did not try going all the way to all low...)
What I noticed is that after the armies meet, and especially when some troops start to run from the battle, the game starts stuttering like crazy.
For some reason though, HW monitor I run shows GPU usage often drop all the way down to 20%, with some spikes upwards to 99%, but then it immediately goes down. Usage is all over the place.
CPU usage shows something similar - It just drops down to like 50-60% with some occasional spike in usage that does not seem to help anything.
On 1.2.0, I experienced high CPU usages, and due to that the FPS would sometimes drop considerably, but it is still better than 1.3.0 which is overly erratic and makes battles nearly unplayable.