Dragon Warrior IV - NES (Emulated)
I wanted to play this over again, since I have not played it since I got an actual cart, but the battle system was just too slow, and I couldn't find (apparently because I am dumb) a NES emulator with fast forward emulator speed. Then a friend decided to tell me that I could use the emulator I always use, FCEUX, and use TAB. Took me 2 days of casual gameplay, so perhaps 4 hours. Makes grinding a dream. I am going to grind the characters levels up to 99, then try and grind for Stat Nuts so I can max other stats.
Also, after grinding, it's amazing to find things that I didn't know dropped from mobs. Somehow I picked up a Wizard's Ring grinding in Necrosaro's palace, nice to have as an emergency backup if Mara somehow runs out of MP.