Does it run any differently or do you just see different memory usage?
Can you take an ingame screenshot with the command "perfoverlay.drawgraph 1" running?
Does it help setting the framerate limiter to 120?
The reason I doubt your 5-9GB memory usage is that I've never heard of it being that high, this is my at 1440p all ultra and I barely use over 4GB.
CPU runs at 100% so it's not running like it used to.
That frame limiter is only for the spikes, in game it doesn't run that high. It used to run like 100-120fps, but now it runs 90-100fps.
I asked my friends when I was playing. How much their RAM usage is on this game now after latest patch. They had it over 5GB.
It's like origin is forcing my battlefield 1 to run like 32 bit
