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It's just the way OMSI loads. As you drive, it loads in new tiles which is what causes the game to freeze. OMSI just isn't a well optimised game and I'm afraid there's nothing we can do. I get it too and I have a decent PC.
I was able to fix it pretty easily, just an issue with the situation I was in. Probably due to quitting and not saving and loading in. i set load all map at start and now the game works smoothly. Thanks for the help! I also changed the ai from using the C400R hybrid back to regular DIWA as it for some reason made ai drive through other vehicles.