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maybe the OpenCore patch with unsupported Macs make slow down the VM, even 1gb but not enough.
maybe that OpenCore Patch on Unsupported Mac, that's why all VM will be slow...
dont set on 4cpu. only 1 cpu will be faster. this is the problem
me too in Mac Pro 3.1 One 1 CPU will be fast in Parallels, do not more than 1 . what ever in Parallels latest version 16