Here is the 32:9 ultrawide mod for 2.20 for anyone who needs it. Dunno how I did it considering I'm just copy-pasting random code and stitching them together.
[Ultrawide32:9 v2.2.0]
04090000 00EB73AC 1E219017
I watched videos with the same GPU and they all dip below 30fps. So it seems to be a GPU performance issue. There are three options. Lower resolution and use mods to turn down graphics. Buy a better GPU. Or wait for the next Yuzu Gaia/Lime update.
I smashed my head against the wall for two days and was about to brute-force the whole thing. But I finally managed to make the 32:9 ultrawide aspect ratio mod to work for 2.0.0. Here it is for anyone who wanted it:
[Ultrawide32:9 v2.0.0]
04090000 00EB64CC 1E219017
I can't enter the cheat thread for XC3. My browser just warns me that it contains harmful programs. And even if I open it on my VM, it behaves very sus. Can anyone contact the moderators?