Having the same issue with my current playthrough. First few hours of campaign was fine but now it seems this playthrough has triggered some sort of leak causing audio to stutter badly and campaign map to freeze. Eventually the freeze clears, up to a minute of waiting and the audio comes back and can move a few more meters on the campaign map until it all goes bad again. This save has my CPU running at 90+% just paused on the campaign map and 100% when lagging. Memory keeps climbing as the problem persists.
Save file:
https://drive.google.com/file/d/1I968ONX4HGg0aYw69NsIbfQdtkRpdx8P/view?usp=sharing
also uploaded to upload.taleworlds.com with this thread title in the description.
Computer Specs:
OS: windows 7
GPU: nividia geforce gtx 1080 ti
CPU: i5-7600k
RAM: 32 gb
Motherboard: MSI z270 gaming m7
Storage Device (HDD/SSD): samsung ssd
Soundcard: Asus Essence STX II
EDIT: Going back to a an autosave from 20 minutes before the lag started and the game has been running smoothly for hours since.