Crashes on incredibly large and expansive maps.

Hello, I'm having an issue 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. Online, people say that the problem is that the game is not optimized for modern hardware and uses RAM inefficiently. They also suggested downloading 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 fix the problem? My hardware is top-notch for this game: 16 GB of RAM at 3200 MHz, a GTX 1660, an R5 4600 processor, and a 3 GB/s SSD. I would be grateful for any help.