[Fireskull]

I copied to the windows partition and it made no difference at all. Same good fps and then a minute in, drop to 9 fps.

System RAM and graphics card dedicated RAM are the same regardless of partition of any other drive. Are you sure that you read my tech topic Sticky at the top of this Forum, I mean thoroughly? In it I reveal many ways to clear more RAM for IL-2.

I asked about your situation in two other websites and no one there even seems to have a clue. Eventually, your problem will be solved but we do not know how at this point.