Other things you can try that are helpful are: use an alternate launcher, this one is the best:
https://www.nexusmods.com/mountandblade2bannerlord/mods/265.
Download Process Lasso (set the games priority to always high, I/O high, Bitsum highest performance mode when game is running (balanced for standard PC usage), and performance mode enabled.
Cap framerate to 60 FPS, make sure the game isn't changing settings. Check your config files to see if anything is off in my documents. The game changed back to 200 which will make it crash. Battle size use a low number.
Update all drivers (Driver Easy is a good way to check).
Took me an entire week of troubleshooting to get it fairly stable, those are just some things that have worked for me. More information is also helpful for the devs. Good luck.