Every time a large content patch or expansion is released, Diablo 4 on my PC starts using an excessive amount of RAM (over 24g). I have run it with metrics monitors open, my PC sits at around 8-9g used with the programs I always run (Chrome, Disc, an explorer window, task manager, core temp, steam, and BNet). When I start D4 this jumps to 22g, then steadily climbs over the space of a couple of hours until it is sitting at just over 31, on a system that only has 32 available. Needless to say this eventually causes my PC to lock up and crash, the only error report in windows is that d4 ran out of memory.
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Diablo 4 has very poor coding, the memory leak has been there for YEARS.
One thing that may help is clearing your graphic files.
That said, 3.1.1 is worse than average.