Gonna post it here too.
The game starts at 6-ish GB of RAM usage, hey, thats still two GB free right?
This is after 90-ish minutes of gameplay.
Follow the guide, but you are, in the end, always going to choke on the ram if you have just 8GB, as there seems to be issues with memory leak
EDIT:
Additonally, what came to my mind, you can use "Memory Cleaner", and set it to constantly clear memory when usage exeeds 80%, its worth giving it a shot. Works in Escape for Tarkov for a lot of people, cant say it will work here
The number one memory usage optimization application in the world just got better.
www.koshyjohn.com
Just check the first two options in "Options" and give it a go.
Ofc, this is all just bandaid that dont fix anything until you get more ram, or the devs fix the memory leak