Please note that we've updated the Mount & Blade II: Bannerlord save file system which requires you to take certain steps in order for your save files to be compatible with e1.7.1 and any later updates. You can find the instructions here.
Hello, sorry for the late reply. We have fixed a considerable amount of the problems we have encountered so far and improved the game performance with the multiple patches we have released. Please make sure that your game, your drivers, and OS are up to date and the game has necessary permissions over your security software. Please let us know if the problem persists after completing these steps and verifying the integrity of the game files through Steam.