I have read something on Reddit that seems to make MCR actually work nicely on Asus boards (I wouldn't recommend Asus at this point, but I have one). You have to enable MCR in BOTH places in the BIOS. Under DRAM timings under the "A.I. Tweaker" tab (also enable "DRAM Power Down Mode" there, happened automatically for me when enabling MCR) and under... I forgot... something like CPU features, MCU, MCU features, Memory Context Restore. Boot time is pretty fast for me now, I think it's better than on the previous Asus AM4 board, which was also not bad.
