Crashes on incredibly large and expansive maps.

Hello, I'm having a problem with the game on incredibly large maps. The game simply crashes with completely different actions: fast loading of a save (F5), building structures in a town, etc. On the internet, they say that the problem is that the game is not optimized for modern hardware and uses RAM inefficiently. They also advised me to download the MMH5.5 mod, but as I understand it, it changes the game and adds something new, which I don't really want. I would like to solve the problem with the current version of the game.
Maybe someone knows how to solve the problem? My hardware is top-notch for this game: 16 GB 3200 RAM, 1660 graphics card, R5 4600 processor, 3 GB/s SSD.
I would be grateful for any help.