4GB of RAM (The Witcher 3: Wild Hunt)

People tell me, please. I've got 4gb of operatives. Somewhere in the region of 800 mb take system processes and so on. I even deleted the antivirus to release additional megabytes of memory. So to begin with the plaque that the operatives are not enough and begins to leak memory. If you predict the alert for a long time the game either flies out or hangs. I kind of understand what's going on but now it's not possible to solve the problem by simply buying 2GB of operations. And if I passed a prologue and a bloody baron with relatively little blood and infrequent departures, for example in Novigrad the game does not last more than 2 minutes. The settings of the graphics do not affect in any way, as it seems to me and should not. Is there any way to unload the operating room or reduce its consumption by the game itself. Of the running processes remained only steam (because the steam license) svchost and explorer. HOW to solve the problem of small blood?