Confirmed fixed — copying the Documents/DayZ Exp profile over the Stable one resolved it completely. Memory usage is stable now. Thanks for the help.

Thanks for looking into this. I tested DayZ Experimental as requested — connected to an official Experimental server and memory usage stayed stable, no crash, no freeze. Completely different behavior from Stable, where the issue is fully reproducible every time.

Also noted re: -MaxMem=6144 — thanks for clarifying it's deprecated on the current 64-bit client, that explains why it had no effect when I tested it.